Timeless Trends 20 inch Overbust Hourglass Regular M in like new condition, worn for shoots. Dimensions in Inches: Center Front: 15.5” Side Seam: 13” Center Back: 15.5” Princess seam (apex): 16" Hip Springs: 11" Bust Spring Small: 7" Bust Spring: Medium: 9" Bust Spring: Large 11" Cup Sizes: Cup sizes for the Hourglass Overbust are based upon your bust measurement and the corset size. You will also need to consider both the front and back lacing gap. To determine your cup size, measure your bust at its fullest. Subtract the corset size from your bust measurement. This is your bust spring. REMEMBER: you have a lacing gap in the back and a lacing gap in the front to consider. EXAMPLE: Your natural waist measures 37" this equals a size 30 in the Hourglass. Your bust measurement is 38". Subtract 30 from 38 = 8 this is your bust spring. You want a snug cup fit with some open front lacing, and a small lacing gap = Small Cup You want a looser cup fit with closed front lacing and no back lacing gap = Medium Cup