This is a summer nagajuban (undershirt for kimono). It's washable at home. I wore it once after buying it new, but the size didn't fit. It has a ro (silk gauze) collar, so you can wear it as is, but I wore it once, so there are a few sweat stains. I don't think they're very noticeable, but opinions vary, so if you're concerned, please replace the han-eri (detachable collar). Please see the 8th photo for the detailed specifications. It's of the product I purchased. I am an individual seller, so please refrain from purchasing if you are concerned about minor details. I will fold it small and ship it in simple packaging.