It has straps that go through the back, so it doesn't slip easily. This is a used item. There are fold wrinkles, but two of the items are generally clean. There may be overlooked stains. The green collar has stains on the back. There is yellowing from edge to edge as shown in photo 8. This item was found while organizing household goods. I don't know the details about the collar. Please make your judgment based on the photos. Please understand that this item has been stored at home for a long time. Thank you for looking.