Often this is just an issue with how hard you grip. I didn’t know HOW anyone could spin with little shorts on for SO long, and now… I’m spinning with little shorts on, with a much grippier pole than I used to have!
I think that learning just the right amount of pressure to put on the pole with your legs and hands is the key. Far better to learn this and be able to transition from spin into a climb or more of a “sticky” move than to have to rely on using powders or whatever else.
But, in the beginning, I wore capri pants. Those worked really well, because I still had most of my lower leg to do grip work, and I had everything else without grip at all. When I wanted to do anything that needed my thighs, I just changed.