Sleepy peach men’s L button up slim fit, fits more like an M!

Was sent wrong size from company by accident. Told to keep it. Slim fit button down from sleepy peach. Polyester and slim fit, is labeled as a large but fits more like a men’s M!!!! Never worn. Brand new. Sleepy peach clothes do not come with any hanging tags just the brand tag on the inside of the back of the collar.