For practicability as sci-fi uniform wear, it's a tossup between the red jacket suits of the second Star Trek movie and the gritty-macho look of the new Battlestar Galactica.
Sci-fi paperback cover art used to have an endless reiteration of doublets-and-jackboots-and-hose, oh my. I got bored with looking at it, but as garb it may actually be practical and comfortable.
Nobody knows
why Zardoz happened, but might one suspect pervy studio suits?
For something forgiving for many figure types, how about the outfits in this thing? --
Girl Genius -- for outfits, read through some from the "Start" button. (Where
do you go for bright green tweed?)