A hundred bucks on costume supplies may not be managing your money well, but it doesn't rise to the level of a hypo/manic spending spree. What does rise to the level of hypomania is the urgency with which you felt you needed to make the costumes, "had to have" certain items and so on.

I've been known to go out for groceries and come home with a new TV. I've gone to Wal-Mart to look at blouses and spent a thousand bucks on new dishes in seasonal colors, table linens, toys and games for the grandkids, clothes, audio equipment, kitchen appliances......

The only thing that limits my spending during manic episodes is the available funds---I don't have credit cards (for good reason!) so I can't buy what I don't have the cash for.