Shout out to Louise Katzovitz and her awesome light-up Thriller jacket.
Each LED strip was laid out on a piece of vinyl strip. Then, a top layer of vinyl was cut to allow each of the LEDs to poke through, with the 3D printed gems super-glued on top. The assembled LED bands are attached to the jacket by Velcro with the wiring fed behind the lining material, which can be removed easily via small hooks. The whole thing is driven by an Arduino Nano and a 5 V power bank.
With the details and process worked out, [Louise] even made a tiny version of the jacket for her dog.