The standard answer depends on how many buttons your suit jacket has. Here are the common rules:
- One-button jacket: Button it when standing; unbutton when you sit.
- Two-button jacket: Button the top button when standing; do not button the bottom button. Unbutton to sit, then button again when standing.
- Three-button jacket: Generally button the middle button; the top button may be fastened if it suits the style or your height, but the bottom button is always left undone. Some styles allow fastening the top button when standing, but you should never fasten all three at once.
Notes:
- If you’re wearing a three-piece suit or a very slim, modern cut, you may see slightly different variations, but the “top only” rule for two-button jackets and “mid button only” for three-button jackets cover the vast majority of looks.
- Always consider sitting posture: unbutton jackets when seated to avoid creases.
If you’d like, share the exact jacket type (number of buttons, single- or double-breasted) and I’ll tailor the guidance to that cut.
