If the size is not shown on the tag of the clothes, you can try to check the size in the following ways:

1. Comparison: you can compare the size of the same dress and determine your own suitable size.

2. Measurement: Measure your body shape with a soft ruler or ruler, and then compare it with the size table of clothes to find out the size that suits you.

3. Consultation: If you still can't determine the size, you can consult the brand's customer service to understand the brand's size standard, and then determine the size according to your physical condition.

In short, no matter which way is adopted, we should pay attention to the different standards of brand size. It's best to know the size standard of the brand first, and then choose the size that suits you.