According to the major e-commerce platforms of Taobao, JD.COM and Vipshop, normal men's wear is generally 20mm, including 22mm, 23mm, 25mm and 30mm. Normal women's suits are generally 20mm, 22mm and 25mm. Generally, clothes without 50mm buttons.

Generally speaking, the more clothes you wear outside, the larger the diameter of buttons you need, and the more clothes you wear inside, the smaller the diameter of buttons you need.