Alrighty, I have some things to share as I've officially started my build!
I've started with the flight suit, which I decided to make from scrubs, for comfort and ease of getting into and out of on my own. I was hoping for a light grey flight suit, but was unable to find scrubs in the color or price range I was looking for. I did however find white ones on clearance at Walmart, so I bought them figuring I could dye them.
This was my first time dying anything significant, and it went pretty well! I didn't even make any messes
Before

In the dye bath (with plastic around to protect my countertop just in case)

And after!

To be honest, in some lights they look kind of purple, but I think they'll be okay overall depending on what colors I put against them. I'm hoping I don't have to redye or start over with something else

Time to start sleeves! I don't really like the look of sewing long sleeves to the short scrub sleeves, so I removed them entirely and cut new sleeves from an extra pair of scrub pants. I used a long sleeve shirt that I think fits fairly well as a template.


Tada!

For pants I basically did the same thing, used a pair of pants as a guide. I went a little wider than these however as they fit fairly snug.

Then tried them on to be sure before cutting, hehe. Don't mind my horrible lighting.

I don't have any decent in-process pics of that but you get the idea. They're pants.
Here is the suit so far, and I do have a few comments about it.
- sleeves need to be hemmed and maybe taken in a bit yet, I just am not quite sure where to end them in relation to gloves and gauntlets/vambraces
- same for legs, they need to be hemmed but i'm not sure where just yet. Once they are hemmed, I'm sure the bunching at knees and ankles will be taken care of
- I will likely sew down the hip pockets, but I wonder if I can keep the leg pockets? I probably won't use them, but I don't think they're interfere with armour or flap open. I just think the fabric might be discoloured a bit underneath from the dye and it would be less noticeable to leave them on. I can sew them shut if necessary
- Shirt will fit more snugly once a vest and belts are worn. Honestly if I take either of these pieces in any more I won't be able to get out of them ^^'

So, that's where I'm at! I'm happy with the progress so far, and of course will welcome feedback

(I may need to edit this if the images are wonky. I'm new at this!)