Place pixels in silicone covers if they aren't already back in.

Glue to secure pixels and wires, snipping any excess silicone off.

Insulate joints on Gemma and pin LEDs to jacket

Optional: wrap pixels in a sheer fabric to match the jacket. 

I used a dark sheer chiffon-like fabric, cut into 2" wide strips. I attached the fabric to the pixel covers using hot glue.

Attach pixels and Gemma to jacket.

I glued velcro to the covered pixels and jacket and used pieces of double sided velcro to hold wiring in place.