Using these tactical pants is super easy. Just put them on like you would with any regular pants. You can pair them with different shirts for various looks, whether you're going for a casual or a bit more dressed-up style. When it comes to the size, make sure to check the size chart carefully as different suppliers and brands might have their own unique sizing. If you usually wear a certain size in the US, keep in mind the conversion for Asian sizes as mentioned. For maintenance, since they're made of cotton, you can machine wash them on a gentle cycle. It's best to use a mild detergent and avoid using bleach. Hang them to dry to keep their shape. That way, you can enjoy these pants for a long time.