I purchased this new online. My child didn't experience much change in sleep duration while wearing this, so it hasn't been used much, but it has been used a few times, resulting in wrinkles, wear, and a stain on the collar. Please check the photos. Please understand that this is a used item before purchasing. Please note that as I am a private seller, there may be overlooked stains, etc. Thank you for your understanding and consideration. *Shipping may involve compression packaging depending on the situation. Please be aware of potential folding wrinkles. The shipping method may be changed from Rakuraku Mercari Bin to Yuuyu Mercari Bin. Please understand. Marine pattern is size M. Lemon pattern is size S. This is a set of two.