Pajamas - I should suggest that one. I did suggest a toga party and the owner liked the idea, but it has yet to be done.

Another studio that I use to go to until it closed down had a favorite athletic team theme and shipwreck where we came dressed as castaways on a deserted island.

"Wherever you go, you represent the team. You will talk like, you will look like and you will act like the most dignified professional in your hometown" - Vince Lombardi to his players.

Besides Holloween party, some of the studios here often had Hawaiian theme party too.

When it came to Pajama theme party, you should see the outrageous attirs the dancers put on. From shower cap, extra large Mickey Mouse house shoes, red hot boxer shorts with hearts ( showing skinny hairy legs ), hair rollers with grey color facial treatment, Victoria's Secret teddy, Victorian style pajama, large towel around the wrist showing hairy chest, house/bath robe and more. ;-p

We had a Hollywoodball about a year ago, where everyone would dress up as their idol, it was great fun!

"Carpe diem, quam minimum credula postero." - Horace