|Water bottle slipcover|
For a friend’s bottle I created this cozy out of T-shirt material. She cut letters freehand and I stitched them centered onto a rectangular piece of fabric about 10 inches wide and 3 inches high. I folded the fabric lengthwise with the letters inside and stitched the 3-inch sides together. I gave myself a six-eighths-of-an-inch seam allowance.
I then turned the resulting tube inside out and, voila, a personalized bottle slipcover.
Jersey knit is tremendously stretchy and these are approximations. If the cozy is at first too loose or its fit loosens afterward, you can try taking the seam in.