Reddit reviews Nike Womens Dri-Fit 2-In-1 Running Shorts-Purple/Blue-Small

Possibly not the most helpful suggestion as we're heading into winter but I run a lot in combo shorts I wear briefs underneath them, but they also work commando.

With regards to leggings, try something with a drawstring so you can keep them over your hips. I don't know how attached you are to your boyshort undies, but I can't wear these for any workouts, largely due to the issues you are having. Would you consider briefs just for exercise?