“Casual” dressier clothes?

I have a few situations coming up that are on the casual side of semi-formal (PNW). Are there ways to look presentable without a tie or a tucked in shirt?

I have a thick and kinda short neck, beard, and traps, so a button up shirt buttoned all the way up makes it look like I have no neck.

Big butt, belly- I don’t look good with stuff tucked in.

Do I have options?
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