Hello fish friends!

I'm going to make a top and headpiece out of an old bra and some quagga mussel shells harvested from a schoolship I work on. What kind of adhesives do you guys recommend for sticking organic material to fabric?
In addition to the mussels I have a set of large scallops I can use for the classic mer-boob look. Those are heavier; should I use something different?


Additional fun anecdote: When my cousin Luke was much younger, he loved watching the little mermaid with his sisters. For, like, three years he would call bras "boob shells." He would bring up bras and swim tops just to ask about our boob shells. It was cute and hilarious.

TY!