I have been researching the best way to make some interesting costumes for my kids. The most popular microcontroller for wearables currently is the Arduino Lillypad. I picked one up to start experimenting with, most people sew the Lillypad to the project, but I noticed others were using snaps. I had an Arduino Lillypad I had ordered earlier and I went to Jo-Ann Fabrics and picked up a pack of snaps to see how hard it was to solder a snap to the Lillypad.
Arduino Lillypad- Link to buy at Amazon
Drtitz Snaps- Link to buy at Jo-Ann Fabrics, Link to buy at Amazon