As FLforFun mentioned, a lot depends on how you carry your body weight, but I've found kind of a uniform that works for me in hot weather. I can't tell you how it looks in photos because I don't like being photographed, but it's comfortable and I'm not ashamed to wear it in public; I even will wear it to work sometimes on very hot days. (I'm old enough and Southern enough that I have mental holdovers from the days when you never went someplace "special" without dressing up a bit, and that included traveling.)
My go-to bottom is a golf skort with an outer quick-dry fabric that is a woven, made of quick-dry fabric or a cotton blend (all-knit isn't as flattering, because it will stretch out around your tummy and pull in around your thighs, causing big horizontal folds in the skirt.) The undershorts are knit and long enough to help prevent chafing. I have two favorite brands: either this one from JCPenney for days when I won't be getting soaked on water rides
https://www.jcpenney.com/p/st-johns-bay-womens-mid-rise-skort-plus/ppr5008418816?pTmplType=regular, or one from Lee (that isn't made anymore) when I anticipate a drenching: the Duluth Trading Dry-on-the-Fly is very similar:
https://www.duluthtrading.com/s/DTC/womens-dry-on-the-fly-improved-skort-46712.html?color=BLE
For tops, I like either quick-dry athletic tees, button-front fishing shirts, or a combination of a thin woven cotton camp shirt worn open over an athetic tank top. Regular tees go totally limp and start to look stretched-out when they have been sweated in. I really like the Magellan Laguna Madre fishing shirts from Academy Sports:
https://www.academy.com/p/magellan-...re-plus-size-fishing-shirt?sku=beach-glass-1x, and the Eddie Bauer Guide style:
https://www.eddiebauer.com/p/238243...irt?sp=1&rrec=true&size=&sizeType=Plus&color=
As you can see, I like classic styling, but a lot of these turn out to be investment pieces that I wear for years, so something that won't go out of style easily is a bonus for me. Fishing clothes, ironically, tend to be styled to look a bit less casual than most athletic wear, but are vented and stay comfortable when wet.
PS: Supportive watersports sandals on my feet, always. I prefer Merrells, but the rest of my family likes Tevas best.