BigCommerce gives WearRoom a clean install path: the Script Manager. You point it at product pages, paste the embed, and the Try it on button appears. No Stencil theme editing, no Stencil CLI required.
Stencil themes work without modification — Script Manager injects the markup correctly. If you prefer the theme route, edit templates/components/products/product-view.html and drop the div in there directly. Both paths leave the rest of the storefront untouched.