- a lot of older sci-fi has people of The Future wearing robes or leotards, or some combination thereof.
- meanwhile, in the present our clothing is growing more and more casual
- but yoga pants aren't that different from leotards, and what is a robe but a fancy snuggie?
- people in The Future are just wearing sweatpants to the nth power
Furry sci-fi setting, so you have "humans" which are a broad variety of Earth animals like normal, but rather than the "aliens" being a monolithic species they're actually a broad variety of anthropomorphic Cambrian period critters.
I guess what I'm asking for is a drawing of Anomalocarsis in sweatpants.