Make some reusable pads from the sleeves of a shirt. The shirt will still work as a t-shirt. 2 - fill the sleeves with a towel or other absorbant material. The cotton sleeve protects the skin, so the material inside can be something rougher. Be sure to choose something (1) absorbant, and (2) clean. +alpha - Use packing tape to affix the pad to panties. Waterproof tape can also help prevent leakage