Yeah. For the spiders, this is gunna suck, but it’s not undoable. I do suspect it will be more of an exo-exoskeleton than a suit though.

There’s a couple of reasons why it won’t be particularly pleasant. The first has to do with how unbelievably sensitive spiders are. Their bodies are covered in a variety of specialised hair like structures that give them not one but two extra senses, and they’ve got extra bits in their knees that give them yet another one. The suit is basically going to annihilate any option of using those (especially the hairs for sensing air motion, which in some spiders are sensitive enough to pick up on the pressure caused by a laser pointer). It’d be like someone shining a light into your eyeball, but body wide.

Depending on whether or not these extra senses have survived into your modern spiders and how strong they are you may need training, drugs or both in order to deal with the suits (as some people may need anti-nausea drugs to deal with zero-G)

The second reason it would either suck or need some exceptional engineering is that terrestrial spiders breathe via almost all of their body. They don’t have particularly dedicated airways or efficient circulatory systems and as such are used to being surrounded by air in order to get enough oxygen into their vital organs. In other words: you need to keep a flow of air between the suit and the spider or they will suffer from the equivalent of hypoxia (which can be thoroughly unpleasant).

That might not seem like an issue, but it really is. Anything pressurised in space will want to puff up like a balloon. That stops you from moving limbs, severely restricting motion. The only way to deal with it is to have rigid ‘space armour’ that air can flow under without deforming the suit, and that comes with a whole extra set of challenges around mobility/cooling. Not only that but you’ll have to have pump air around the suit in order to keep it oxygenated. Pumps vibrate.

Remember those weird knees I mentioned earlier? They’re super-sensitive vibration sensors. To the poor spider inside this vibrating, solid tin can it’s gunna be thoroughly unpleasant.

Manipulators are simple at least as spiders don’t have dexterous fingers to worry about. As such ‘bond villian’ claws can be added to the ends of the suit and operated using simple squeeze actuators without being too weird. Or you could replace with a variety of simple tools. And any suit umbilicals also have a natural attachment point near the spinnerettes where they can be grasped by hind legs.

So basically: armoured, mechanically clawed, permanently on edge spiders floating through space.

Yeah...

They don't need a spacesuit just oxygen

Warning - Video of a spider in a vacuum chamber (it walks around and lives to tell the tale).

https://youtu.be/tA9jcIwvge0?t=243

Judging by the video, they don't even need oxygen for a short space walk.

In response to temperature concerns

It really depends where in space they are. Right next to a star they would be burnt up regardless of a space-suit. Away from any stars they would be frozen solid eventually. Their spacecraft could perhaps beam infra-red at them.

However:

At the Earth's distance from the sun, a space thermometer with roughly
half its surface is absorbing sunlight would register 45 degrees
Fahrenheit.
https://www.space.com/14719-spacekids-temperature-outer-space.html

Also many spiders can survive temperatures below freezing.

"...About 9% of spiders in relatively mild areas remain active
throughout winter. These are nearly all Linyphiids who can still make
a web at temperatures as low as -1°C. ..."

https://www.amentsoc.org/insects/fact-files/overwintering.html

Bonus fact

When they go on space-walks, because they're not enclosed in a suit, they don't have to worry about a connecting cable - they can use spider silk to hold them in the place they need to be.

I'm going to go in a different direction here and say that instead of making a space suit, make a space pod with mechanical spider legs.

Have an enclosed pod that the spider can sit inside with legs folded and have mechanical arms/legs that support the pod and allow it to walk around. For simplicity, the pod could have 4 or 6 legs, but there could also be different pods for different jobs with a variety of legs or attachments.

This has the benefit of looking like a spider suit, but doesn't have any of the complexity of trying to allow them to use their own legs.

Hamster ball

A hamster-ball for spiders allows them to breathe through their body, and move around by rolling like a hamster in a ball. Of course a simple plastic ball wouldn't allow much work to be done, but a high-tech ball could have various mechanical appendages to perform any work a space spider needs to do.

Tarantulas have retractable claws, similar to that of a cat, so it won't be a far stretch to think a spider could use these claws to fit a suit on.

Tarantulas have a respiratory system that uses book lungs to process oxygen. Tarantulas process oxygen at extremely low rates.

The hairs, or urticating bristles, are a defensive mechanism, early warning system(think Spidey Senses) and even a survival mechanism(some tarantulas use these bristles to create an air bubble around them, giving them potentially hours under water without the need to resurface for air).

Tarantulas are generally measured in diagonal leg span(from the tip of the front leg to the tip of the opposing rear leg).

Tarantulas generally become less active in the cold. Often not eating or drinking for months, or possibly years at a time.

Looking for videos of "tarantula molting" might give you some ideas how they could get the suit on/off. Molting is the process of shedding the old skin.

With all the above information in mind you will need to consider;
Are the suits needed for short space walks or would the Tarantulas be wearing them semi-permanently? This will determine if the suit needs air, heat and durability to elements).

I would design a suit where the only opening would be on the under side of the Tarantuals carapace. Allowing the Tarantula to fit it/remove it in a similar process to how it would molt. The fabric should allow the bristles to 'poke' out. The suit should retain warmth and small amounts of oxygen.

Technically, there are two main challenges with space suits.

1) Keep them loose enough and yet tight enough. Human limbs have bulgy muscles and such, to too tight and it's awfully uncomfortable. Platemail or plastic tubes wouldn't really work. For something that has an exoskeleton, this isn't a big deal, you're just duplicating that, essentially making the exoskeleton thicker.

2) Joints. Again, this is a challenge, but not too hard. Unlike with humans, all joints in a spider are relatively simple. There are two types: ball-and-socket, and hinge. Hinge (all the knees) are the simplest possible joints in engineering terms, but ball-and-socket (where legs join to body) are a ginormous pain in the ass in every imaginable engineering aspect.

Not impossible, just so prone to failure. Rather than a ball and socket, probably best to make two hinge joins in a chain, at rightangles to each other. Almost as good as a regular hinge, with most of the advantage of a ball and socket.

What it should end up like, is basically just a second skin. Spiders are already used to this, and used to getting out of them at least, as we see here:

https://i.imgur.com/9K95I6E.gifv

You need to step back for an easier "in". I said in my comment to @Joe Bloggs's answer:

Based on how "dull" modern humans' senses are in comparison to our ape
cousins, I'm gonna say no. We're not even all that far from
chimpanzees, and [by comparison] we have hardly any sense of touch, smell, taste, or
hearing. Sight is the only comparable sense.

Compared to other
mammals, we're practically cut off from the world.

It's hard to
imagine a technologically advanced spider being just as endowed with
senses as its more primitive ancestors and contemporaries.

To answer the question based on that evolutionary assumption, then, you need to answer some questions about what these spiders look like, and how they feel about nakedness. I'm not talking homburg hats and four pair of Docs, but do they have any form of clothing? What are the names of the garments?

Anyway, to practical matters:

• Their hairy legs can be practically bald; and wearing a suit would only be as irritating as wearing socks in bed is for me, i.e. a little bit, nothing like unbearable or overwhelming. Sure, let's say they might need to put on some form of undergarment for protection.


• Their elbow/knee ears could be fed audio communications, designed into the suit, or the undergarment.


• Multiple eyes could be used for different purposes, assuming the minor pairs haven't atrophied by evolution.


• Breathing wouldn't be an issue. Human space suits are pressurized. (If you have gas, you're breathing that back in.) I would assume that spider space suits would also be pressurized.

Everyday clothing is going to be your clue for how to talk about the different components of space suits, and what limitations they might impose on the wearer.