[Source] Flat rubber strapping

Hello All,

I am looking for a source of “flat” rubber cord that will lay flat
as a necklace when using a toggle arrangement for a clasp. I have
found flat cord but it buckles up as the ID is smaller than the OD
when worn around the neck and just long enough to lay on the chest.
A 3/8" or 1/2" wide by 3/32" thick would be ideal.

Surely some of you nice people have been there and done that. I
really don’t want to re-invent the wheel.

Thank you,
Richard Langbert