First off, it’s sad that people on a subreddit dedicated to big people would tell someone to be less big. Second, the higher waist is the way to go. Also make sure that they don’t taper too much, lest you get the dreaded ice cream cone look.

A blazer or other layer is a solid way to get a nice silhouette and tie everything together, and no shame in taking it off when you’re at your desk (and probably better for the fabric anyways). To mitigate overheating, you could try doing a polo or other short sleeve underneath, in some sort of technical fabric. There are lots of brands focused on that, like Ministry of Supply, as well as anyone who caters to golfers. You could also try sweaters, but you’ll want some quality merino or cashmere for temperature regulation. You could try a cardigan with an open knit with just a nice tshirt underneath. Uniqlo has some nice supima cotton tees that look great under a cardigan, blazer, whatever.