I like vests for all seasons, and photo/hunting/travel type vests with lots of pockets are fine for some circumstances. But I've been shopping unsuccessfully so far for a summer-weight cotton casual-dress vest with maybe two pockets low down. Something a little more stylish than the pocket-laden khaki type but not as dressy as a suit or tux vest. I do have one bought years ago at Jay Jacobs that hits just the right note, but the store chain went bankrupt.
I like some kind of loose outer garment to conceal suspenders and weapons... 🙂 Sweatshirts and warm vests work in cooler weather, tough to find something attractive and suitable for hot weather.