I used a little bit of black thread myself. I can always unstitch the small line of thread, if needed to be washed, and throw another little stitch back on after vest is washed. Takes maybe 5 minutes to sew a stitch across your braids. Plus you know they ain't coming off then!
Here's another 2 ways to do it.
Shown are 2 braidsets together,one has a small snap sewn onto the end that hangs at the rear of the vest,and another snap on the shoulder near the bell.
The next shows a piece of scrap velcro sewn onto braidset,again one at rear vest,and one near shoulder bells.
Both snaps and velcro are hidden,and easily removeable.
It's a little bit fiddly,but both work.
Ah yes,it helps to sew the braids together at the 'mounting points',I use a thin,clear monofilament fishing line threaded thru the sides,good and strong,but any colour thread may be used if you sew from the backside of the 3 flat braids.They don't have to be sewn together tightly,just enough to hold them together.
Heres the photo of the snaps and Velcro method.
Both photos are the same,but the semi-tutes are different.
As for braids, I have 3. Blonde, Brown and 'salt 'n' pepper' (black with grey mixed in).
I went to Tandy and bought some leather "shoe strings" black and brown and tied them up in areas, then took one of the leather laces and tied them together very securely (used a full lace for it.) Even took some plastic bone pieces and hung them from the leather strips for a little extra ornamentation.
If interested, I can take a few pictures of the braids and post them up here.