You know, it's interesting that despite TS4's cartoony art style the devs decided to make bra straps and panty lines visible on certain clothing. : r/thesims
Top 10 Best Sims 4 Lingerie CC [2023]
The Sims Resource - Hello Kitty Pink Panties for Girls
The Sims Resource - Default Replacement Underwear Top and Bottom (Bra / Panties)