2. If there is one line on the front and back of leggings and the other line. Then there are usually two lines at the back and one line at the front. Because the two lines indicate that the crotch is specially added in this position, it will feel much looser to wear squat. Unless it is special purpose leggings, such as those for pregnant women, it is designed to be worn with the front two lines on one side and the two lines on the other side are specially designed to support the big belly.
3. If the front and back of leggings are two lines. Just like the first one. Feel free to wear it
4. If there are obvious embossed designs on the front and back, such as a triangular indentation on the front and two egg-shaped indentations on the bottom, then wear it according to the indentation.