How to make a duct tape bracelet

First choose your duct tape!

Tear off a strip and set it sticky side up on a solid surface

Tear off a second strip and place it on top of the first one. Sticky side to sticky side

Trim up the edges if needed

Take a strip about 1cm wide...

...and fold down the top of it...

Then stick it to the end of the bracelet; and that would be used as the fastener.

-end result-

BUT, of course you can always just use some velcro

And fasten it like that :)