DIY 3 Strap Bra for Backless Tops and Dresses. All you need is: a strapless bra in your size (preferably pick one with boning in the side so it does not collapse on itself.) - Elsie Ladies Fashions by love_l
Worth a try. Maybe I'll wear some of the t-shirts that just sit in my bin... diy tank- I did this and it turned out really cute!!
27 Useful Fashionable DIY Ideas | Charming by Design