1. Observe the fabrics on both sides and the front and back. You will find that the number of fabrics is different. Generally, there is a whole piece of fabric on the front and two pieces of fabric on the back.

2. Observe the trademark. Generally, if there is a trademark on the clothes, the trademark will be sewn on the back, and it will be at the top. In addition to the trademark, it can also be judged by the washing mark or the ingredient mark. The positions are similar.

3. Observe the crotch. Since the front and back of the crotch are different, the design is also different. There will be an extra "triangle" in the back. If you see a triangular area in the crotch, it is the back.

4. Observe the front and back length. Some cotton pants or tights will be shorter in the front than in the back, and there will be some wrinkles in the buttocks, because the buttocks need to occupy a larger area of ??fabric than the lower abdomen.