I measured by hips and waist to try to figure out what sizes to order. But they're never in the same category (I guess I have too much blubber around my middle). Should I go by my hip or waist measurement when determining my size?

I've also noticed a lot of people commenting on how sheer some riding shorts are. I'm terrified of the idea of someone being able to see through my pants. Any tips on which brands to avoid?