When out trying on different button-up shirts, do something you may not have considered: sit down in your shirt before buying. Since slim is in, many (fashionably aware) men these days have overcompensated by buying slimmer and slimmer garments. The result is a shirt that might looks like it fits well when they’re standing in front of a mirror, but as soon as they sit down, the placket will gape and the buttons will strain as their stomachs push out.

A well fitting shirt should have relatively clean lines no matter what position your body is in. See the two men above from custom shirt maker Anto as examples. The one on the left has a shirt that’s slim enough to be flattering, but also comfortable enough to accommodate his body while he’s seated. Naturally, a shirt may feel tighter in the midsection if you slouch, but if you’re sitting up reasonably straight, the lines should remain fairly clean.

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