Untucked shirts

So I got an untucked shirt that I thought fit okay, at least standing. But now sitting down it can easily show my stomach when moving around. I'm going to return this one regardless because it rides up too easily, but what are the rules for untucked oxfords? Are they supposed to be worn with an undershirt? Or are they okay on their own, as long as they fit well?
1 Reply
bishopcorrigan
bishopcorrigan12mo ago
The latter, undershirt is basically preference