I use the little rings from bras as stitch markers. Saves money and you are sometimes in for interesting colours. Though, of course, they don't come along very often. You have to use the bra first and if you are a thrifty person like me you don't throw away your bras that quickly. I have accumulated quite a collection of different colours and sizes in plastic and metal. I'm a bit shocked how many bras I must have had over the years, also given that these rings have a tendency to disappear like safety pins.