Absolutely adorable! Measurements in photos, fabric is a cotton that doesn’t stretch but the hook on back has a band of elastic that gives you a couple more inches. I measured 14.5” across bottom seam of bra. Straps are 8” long. No major issues, but it is vintage and shows signs of wear. I am only guessing it’s about a 30A? maybe B cup based on the measurements. No tags attached. Bin J