WealurreWomens Underwear Cotton Bikini Breathable Sport Low Rise Panty for Women Multipack

Q: What about panty lines under fitted clothes?

Depends on how fitted, but they do leave a somewhat noticeable panty line

Q: How small do these run? i normally wear a size 6/medium in hanes underwear, and i have 39" hips. should i order large or xlarge?

Order X-large. I am usually a size 5 (36" hips), and when I bought these in size small, I wound up giving them to my daughter, who is tiny! Then, I bought size med for myself. I think some people my size would have felt fine in this size, but I didn't like how they made sort of an indentation between my butt and my upper leg. So, I finally bought large, and I'm about to buy a second pack. They are amazingly comfortable and never ride up, either.

Q: Where is the size chart for this item?

I don't think a size chart is provided, and I already threw away the packaging so I'm not sure if there was one in it. It only indicates they are true to size, which seems the case to me. I wear size 5-7 depending on brand and medium fits me comfortably.