If you bought it in a big shopping mall, you must have it.

But if you want to verify the authenticity, you don't have to look at the tag.

When you turn the clothes upside down, there must be a washing label inside, not the one at the neckline, but on the side of the clothes, with the earth logo and model of Ports on it. This model is the symbol of Ports's clothes. You can see if you have it, or you can send a model to help you see it.