If you write up a quick paragraph, or put that your history or LA studies include things like knights, you can buy puppets, a puppet theatre, costumes, face paint, etc. We've done that, and the kids get a TON of use out of their puppets and costumes.
Other parents have had issues getting stuff passed through (usually the teacher just wants a quick jot of what class it's for--like rocket kits for science, dress-up for history, etc).
We also turn in receipts for things like the four boxes of corn starch I bought for doing different experiments, huge bags of epsom salts, borax, etc.
A good way to ask yourself if it will be acceptable use of your allotment is to picture a K or 1st grade classroom. Do they have that stuff? They have Legos, costumes, blocks, puppets, even train sets. If you can figure a way to tie it in (blocks are math, puppets are history or LA, costumes are history, LA, even science, Legos and K'Nex are science, etc), then it should be acceptable.
If it ties to anything in your curriculum, run with it!