Here a few in my short experience...
"Are you part of a dance troupe?" - Vendor at flea market
"People don't get dressed up to go about the town anymore, it's lovely!" - Vendor at flea market
"HARAJUKU!!!!!!!!!1!1" - Some Guido-type outside of a bar in Philly
"Love your costume!" - Various
"You look like a pastry." - Younger bro
HAHAHAHA it amuses me when people don't know how to react to fluffy dresses.