Some of our items are one size fits most and made to be worn loose. They are usually a medium/large but adjustable to size down. Almost everything that is o/s is made with some type of adjustable belt, strap, tie, or it will have an elastic waistband. You can find a sizing chart on each item. We realize one size fits most will not always fit and will not look the same on every body type and that's why we have a great return policy. If it doesn't fit, feel free to send it back. Please don't hesitate to reach out to us with any specific questions on sizing.