You don't need to cut the clothes when they are big. Cut the clothes, and you won't be able to put them on when your figure changes. Here are the steps to make clothes smaller:

1. First, prepare big clothes (below, use tops as a demonstration) and needle and thread.

2. Find the seam on the side of the clothes, find the size that suits you, and sew it. As shown in the figure.

3. Then use the needle to pass through the symmetrical part on the other side, as shown below.

4. Then sew back and forth several times according to the above steps, as shown in the figure.

5. Then tighten the sewn thread to make the clothes shrink. As shown in the figure.

6. After tightening the thread, the clothes will become smaller. As shown in the figure.