ST. LOUIS EXPANSION VEST makes really good singlets which gives a tight comfortable fitting. It is 100% made of cotton.Made out of cotton to give maximum comfort, this Plain white Singlet is perfect under shirts and traditional attires. It's comfortable and gives a clean and dapper look. It's also easy to walk/work in. Fitted, simple and made of high quality cotton fabric, this plain white singlet is perfect under clothe. Comfortable and gives a clean neat look.