Step 1: Stencil and cutting
Step 2: Adding the leg straps
as u can see there are no sides to hold them on so use what cloth tape u have left to make the straps. tape it together with strips of tape so they blend in and trim to blend.
Step 3: Making the straps stay together and fit all the time
if you add small pieces of velcro to it you will almost guarentee it will fit all the time and stay tight.
the reason i used cloth instead of just lining it with ducttape is i dont think using a lot of duct tape on your junk would be very comfortable.
i used velcro so girls with larger parts can fit in it or girls with smaller parts can also fit in it
it will stay tight cause you adjust it to yourself.
also if you dont want to have the velcro shown you can slip a bit of duct tape over it or just size it to yourself