You measure the centimeters around your waist and look at the specifications according to the data. (GUCCI's specification is to remove the G head, G tail and the part around the waist in the middle. You can buy waist-length ones, and the spacing between each hole is 2.5 cm)

The mainland store is at least 80, which is useless. Big change and small change. Just cut a piece at the tail. Buy 1 10 to change the size to suit you.

PS: Europe is not necessarily cheaper than Hong Kong. I hope you can choose your favorite GUCCI~ and give it to me.