Unfortunately, sometimes even offline stores can sell non-original goods, especially if they are multi-brand outlets. That is why it is important to know the signs of genuine items. I saved this article for myself:
https://legitgrails.com/blogs/news/how-to-spot-real-vs-fake-polo-shirt , which shows specific details that are difficult to fake: the shape of the embroidery, the density of the fabric, and the location of the labels. This knowledge helps you feel more confident regardless of where you shop.