The straps go through the back, so it doesn't slip easily. This is a used item. The red and white ones have wrinkles, but are generally in good condition. There are also fold wrinkles besides those in the photos. The pink one shows signs of wear. There may be overlooked stains. These items were found while organizing household goods. I don't know the details about the collars. Please make your judgment based on the photos. Please understand that these items have been stored at home for a long time. Thank you for looking.