timeless addition to nightwear collections made from pure-cotton flannel piped trim on the collar and patch pocket elasticated waistband for extra comfort the cotton flannel we use for our pyjamas is brushed twice on the inside and once out, making it unbeatably soft against the skin and plush to the touch. the collar and patch pocket feature smart piped trims, while the matching pull-ons have an easy waistband, which is fully elasticated for comfort.