For wings see Ayshe
http://www.wingsofayshe.com/wings_shop.html
She has the best wings and does custom work. Since you'll be in the city you can probably meet with her to look at different fabric samples etc.,
www.decotach.com custom makes skirts and costumes in NY
If you make it out to Long Island you can visit Topkapi. They have a boutique there.
www.topkapidesigns.com