I've always been thrilled with Simply Merino items, so I immediately bought 2 pairs of these shorts. I wear 2X in other brands, but based on measurements I get XXXL in Simply Merino. I wear these shorts under dresses, and they are incredibly comfy. The rise is high enough to stay put, but not awkwardly bunchy (other shorts I end up having to roll down at the top). The fabric is lightweight and breathable in hot weather. After a couple days of sitting/standing/walking, the shorts have performed great--no visible seams/bumps under a layer, no hitching them up all day.
The one missing star is that I really wish there was another 1-2" of length on the inseam for plus sizes. The fabric doesn't actively ride up when walking, but after sitting I do have to pull the hems back down for thigh coverage. I'd love a crop/capri length legging someday (the Simply Merino full-length leggings are my favorite), but these were a great investment for an early summer.