A picture or link would help a lot, but I think I have a general idea.
Any kind of appendage: wings, horns, extra arms, tentacles, robot parts, etc. Needs a solid foundation underneath the clothing. The typical set up for girls doing fairy or angel wings is a longline bra or corset/ waist trainer type garment* that a long loop of wire that is part of the wings slides down into. This will work for you with several small pairs of wings connected together in one wired piece for the part of your back that starts at the base of your shoulder blades, but not so much your upper back. This leaves a fair number of experiments ahead of you.
I recommend the following testing system:
- go to your nearest big box store and buy this: https://www.homedepot.com/p/OOK-14-G...-100200924-_-N
note this is 14 gauge, that's a good size for wings. You also need some pliers and or wire cutters https://www.amazon.com/Stanley-84-10.../dp/B0001IW518
This has cutters and a narrow tip.
- Get a close fitting garment along the lines of a waist trainer, maybe an under armor shirt, etc. It's ok to look second hand.
- cut off several yards of wire. Get a friend to help you straighten it out (it'll be really curly off the spool). Fold it in half, make off a section roughly the same length as your undergarment, then make several loops roughly the size you want the wings with the rest. Fold your long section over so you can slip it inside the garment. Try it on. It will NOT be comfortable! but this is just a test, so two minutes won't be an issue.
- Have your friend adjust the wires (unless you're a contortionist) and make note of what works and doesn't. You might need a different undergarment. You might be able to reinforce it. You might decide it's a terrible idea. At this point it's how creative you are but the cost in is fairly minimal.
*modern spandex with a little bit of light boning will suffice. https://www.walmart.com/ip/SAYFUT-Wo...l13=&veh= sem
or these are lighter weight https://www.target.com/p/maidenform-...09#lnk=sametab