This is about hygiene, not visible panty lines.
Dear Kate
Pants To Wear Under Gym Leggings
What To Wear With Workout Leggings
What Are 7/8 Leggings & Should You Try Them?
Do You Need Running Underwear?
Do I Need To Wear Underwear With Leggings
Do Women Wear Underwear With Leggings
Do You Wear Underwear With Leggings
Stop Wearing Boxer Shorts
Do you or do you not wear underwear with yoga pants?! – POPFLEX®