Under normal circumstances, the cheapest way to change the waist is one or two hundred yuan, mainly depending on the price of the suit. You can take it to the original suit shop and change it. A better suit shop will have a change service. Or you can find a good tailor and put on your clothes. If you look at them, you will know how to change them. Clothes that don't fit must be changed. If you wear a suit that doesn't fit, the price will go down. You might as well not wear it, just like borrowing it.