How can I tactfully tell a young friend of mine that she really needs to wear longer, looser shirts?

I’ll call my friend Jane. She would be considered obese, or very close to it. As a result her pants tend to slide down on her hips. She favors wearing sweat pants and T-shirts. The problem is, when she sits down the pants slide down below her hips and her shirts slide up. When she stands up her butt crack is on full display. When she’s sitting next to you and stands up, then moves across you it’s right in your face. She pulls her pants back up, and her shirt back down but often that still doesn’t quite cover it all.

Also, she tends to take her time adjusting her clothes. Like, if she’s sitting down, then stands up, she does it as she’s moving across the room, instead of doing it before her back side moves into sight for the whole room to see.

It happens when she bends over too, which she does often as she has a two-year-old and infant that she has to pick up often, and has to bend over to put in car seats, and things like that.

I know she’d be mortified if she realized the display she’s putting on. I know she can feel it, but since she can’t see it, maybe she doesn’t realize how awful it looks.

I did make a gentle comment once, like, “Honey, you need to pull your pants up.” She became angrily defensive. “I can’t help it!” was her response. I haven’t said anything since.

It could so easily be solved if she just wore longer, looser shirts but I don’t know how to tell her that.