If you are very handsome, you will look good no matter what you wear. But if you look plain, the things that fit for other people may not fit for you. So you'd better have a try in a physical shop. There are all kinds of sunglasses for you to have a try. After you find a pair of sunglasses that you like, you can remember their size and style and then search on the internet to buy a pair of the same kind of sunglasses. The sunglasses sold online are much cheaper. This can save your money. Good luck!