The main reasons why Zishu clothes are expensive are as follows:

1. Zishu clothes are made of serge fabric, which is thick and soft, expensive and expensive to make, with a price of RMB 0/00 per meter/kloc.

2. Zishu clothes are handmade, which ensures good quality, no pilling and no shrinkage.

Based on the above two points, it can be concluded that Zishu's expensive clothes are determined by its fabric and production technology.