If I were you I'd buy them. You can have a very nice (and expensive pair) made for you by Ayshe in New York (
www.wingsofayshe.com), or you can get Egyptian made wings from Dahlal, Audrena, or Little Egypt for less.
BUT if you insist on having them made, be aware that they have to be professionally pleated, and that can be the hardest part, since you can't find professional pleaters in every town. Otherwise you have non-pleated, flat wings. You can use irridescent organza (not the stiffest kind, it needs to have some flow to it) or tissue lame.
Measure from your neck to the floor. This will be your measurement, your seamstress will take this measurement, and create two half-circles from it.
You can use acrylic blind turners for sticks, or if you have a plastics company in your town, you can purchase a 1/4" acrylic rod. You will cut it to approximately 18", or long enough to reach from about 4" past your wrist to the end of the fabric. Blind turners are generally already the perfect length, and have a nice flex to them.