I should think your handle provides one solution. Pad your bra -- and maybe your panties -- with nettles and wear them for a day. Otherwise, making a tack brad is pretty simple. Get a padded bra (more substantial than an unpadded one) and stitch tacks in to the cups. You can just sew the head of he tack into the lining of the cup. Looks won't matter because no one is going to see it anyway. As long as the tacks are secure enough that they are sturdy, they will provide pain. One nice thing about tack bras is that, as you move, they will be agitated and provide even more pain.