I also posted this on the SO board:
My teen girls always do a "funny" joke routine in the recital each year, it is known around the studio as
"The Secret Dance" that is a surprise for the recital. Anyhow, this year we are doing an alien/martian routine. They will be wearing alien masks on their heads. What we are stuck on is what they will wear on their bodies. We want them to look funny but we really dont have a lot of time to make anything too elaborate. Any ideas, please help?

You can always go green unitards those are pretty simple. I suppose depending on the color of the mask you could do different colors to match the mask.

Most expensive and sleek: Bodywrappers Silver lycra dance tops and jazz pants that your team could wear again? Middle cost and slim: Cheap nylon white or old light colored pink or baby blue cotton leotards and old ballet pink tights you can dye green? Cheapest and corny: Old dads' white t's covered in Duct Tape and old sweats or tights with "artistic" duct tape slashes. Could stuff the sweats with newspaper or towels to make fluffier Martians or Aliens.

I did men in black ages ago...kids wore black bike shorts bright leotards and had 2 different colored legs. Get 2 pairs of tights, one loud and one more neutrL. Cut 1 leg off the loud pair keeping the crotch and waist band intact. Wear the loud pair of the neutral one. Wear the cut off leg over your head like a bank robber...