These are double ended clips. Sew loops where you want them and clip them together. Sometimes I file the "latch" on the free end to make it easier to disengage.
If you're interested, send me an address, and I'll mail them.
As I type, my e-mail server is down, so I won't be able to do anything until it is restored. But, hopefully by the middle of the week.
Let me know here.
Then PM or email direct to greg at smgm dot org