Informal wear is clothing that you wear when you're not really trying to dress up fancy. It's the clothes you wear when you want to feel comfortable and relaxed.
For example, you might wear a t-shirt and jeans to hang out with your friends or a sweatshirt and leggings to lounge around the house. Informal wear is usually pretty basic and simple, without a lot of fancy designs or details.
This kind of clothing is great for everyday wear because it's easy to move around in and doesn't require a lot of effort to put on. Plus, it can be very affordable, since it doesn't require a lot of specialized materials or craftsmanship.
Overall, informal wear is great for when you want to be comfortable and casual, without worrying too much about how you look.