When it comes to shopping for clothes online, choosing the clothing right size to fit you can be challenging. This is because all of the clothing manufacturers and suppliers from all over the world are using different measurement standards. To shop online for clothes to get your perfect fit, we recommend you to get yourself a measurement band. It is available on Amazon for less than $5. Different online clothing shops will have different size guides ranging from XS to XXXXL. This is because they are mostly measured manually by manpower. The measurement error can go up to 3cm or 1 inch depending on brands. It also varies based on countries. For relaxed fit clothes, we recommend going with 1 or 2 sizes larger for comfort and oversize style.