The creep also drives me crazy, but I can't imagine going commando under most of my clothes, especially jeans! No thank you, I want the barrier between my lady parts and everything else.
The one kind I've found that work fairly well are boy short underwear. I got a few pairs at Aerie last winter that I like, though they are not really summer weight (they are like a herringbone knit, which sounds ridiculous but is actually really soft and comfy). I don't see the ones I have on their site, but I'm considering some of the longer pairs they have, including these:
https://www.ae.com/us/en/p/aerie/undies/boyshort-underwear/smoothez-lace-bike-short-underwear/2771_7824_073
The nice thing about boy shorts is they truly do not creep up.
I also think I just have to replace my underwear more often because like you, I find they start to stretch out and get loose after not that long, and then even if they didn't used to creep up, they do.