Do people dress up nicely on dress up days?
first of all what kinda dress up day is it? but if it is a "nice" dressing up day then the blk dress is alrite but i dunno if the heels are necessary.
How to find a mannequin?
jump into m&s with a balaclava and an air pistol, scream"i'm taking the mannequin, don't flippin stop me" and run with it through your local shopping precinct. cost=free, plus a nice floral dress for sale which cost you nowt!
dressmaking equipment?
eBay has the best prices. Look for the "Buy it now" deals. They usually include shipping. Check out all the deals on eBay -- the regular site, the stores and the express section. There are different sizes and styles. There are other dress forms avail...