https://www.amazon.com/gp/product/B001U2V7K4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
It's like padded underwear for male ballet dancers to hide their bulges in tights but we use it in ballroom to make our follows less uncomfortable. The back of it is just a thin string that runs into your buttcrack.