I have made dancing costumes for my daughter now for 24 years ( she is now 27) ..thought it was over then I got 3 grandaughters !!!
I always make any costumes they may need for Halloween , parties or dancing shows..we recycle old ones sometimes ,and I encourage the girls to help , teaching them to use the machine etc. We also make costumes for the boys sometimes but they are always ghosts and Ghouls and all things horrible !
Try the internet for costume suggestions .....look under Childrens Fancy Dress, and good luck !!