I use dental floss to sew mine on because its tough as nails and very strong, but not as hard to work with as fishing line.

I like to attach all my coins to chain and then sew the chain down. It lets them move more. I usually just use quilting thread.

Upholstery thread works great for stiching anything you want to attach in a secure manner. I also use it on costumes to reinforce points that take lots of wear and tear or have to support weight and pulling stresses, like when attaching new bra straps or fasteners. It comes in a variety of colors, mostly neutral, so it's easy to match especially for tribal fusion gear.

I've used carpet, upholstery, nylon and beading threads. They've all worked well for me. I tried fishing line and after a few minutes of struggle I abandoned it. Whatever you pick make certain you are able to work with it easily. Frustration and/or sore fingers will ruin the fun and maybe stop a project short of completion.

The key things for sewing on coins. Is the thread going to get torn or cut by the edge of the coin hole (test this with your thread and coins)? Will the coins move and dance freely? Will the thread tear the base fabric? Can you easily sew with the thread? Can you tie a knot quickly and solidly with the thread.

My favourite... beading thread. Synthetic, tough, soft, light, comes in 4-8 colours (depends on the supplier/store), easy to tie knots single-handed easy to thread on a needle, easy to sew with.

Once upon a time, dancers used to sew everything on with dental floss. Nowadays, beading thread is a good substitute.

well... I did a bit of this and that...

I sewed some stuff on with embroidery floss, some stuff I strung onto a crochet chain and sewed that down, and the others I used wool yarn..
sooo...

we will see =)

its quite pretty =) when Its "ALL DONE" I will post pics... Just got the yarn for my fringe and tassels dyed today... I am thinking that I need to spin some more up... and dye more... heh...

I use beading thread that is waxy, much like floss. I never use dental floss because some floss is now being designed to better bio-degrade in landfills and (I live in Japan) I have no clue what kanji indicates that, or if it is even mentioned on the packaging.