西裝袖口問題(20分)

I have answered this question before, please see my previous post:
There are usually four sleeve buttons on suits, 3 buttons on sportcoats or blazers, and 1 or 2 buttons on country coats.
These buttons and buttonholes are meant to be functioning. When in need, you can unbutton them and roll up your jacket sleeves.
There are many stories regarding the origin and the tradition. One of them is about surgeons, in the old times, having the need to roll up their sleeves while operating (remember surgeons and doctors travel from places to places, not always in uniforms operating in big hospitals like nowadays).
Nowadays, if you get your suits made at tailors, these buttons are always functional buttons - meaning, the button holes are open. In ready-made suits from cheaper brands to Armani, the buttonholes are closed and the buttons on sleeves are merely decorations.
All of my suits are bespoke (custom-made), so all the sleeve buttons are functional. However, I usually keep all of them closed; sometimes I open just one in suits, or two in my sportcoats.

西装袖一般都是不打开的，你想打开的话得看原本西装袖的钮门是真定系假。若是真的就可以打开/