"Underbust flat measurement" refers to the width measured horizontally across one side of the swimwear when laid flat, at the underbust support area, and does not include the bulging part of the cup; if you need to refer to the full circumference, you can multiply the value by 2 (see "Approx. Underbust Circumference" in the table above). All measurements above are garment flat measurements.

When measuring, customers should wrap a soft measuring tape around their underbust (below the breasts, close to the ribs), keeping it level and slightly snug; this will be your underbust measurement. Size 9 is more suitable for an underbust of approximately 66–72cm and an A–B cup; Size 11 is more suitable for an underbust of approximately 72–78cm and a B–C cup.

Since this style features a fitted, one-shoulder design with non-elastic straps, there is less room for adjustment in the straps and underbust area. If you are between two sizes, or if you have a fuller bust and wish for a more secure fit and higher coverage, it is recommended to choose the larger size. If you have a slender figure, a smaller bust, and desire a more streamlined and snug fit overall, you may choose the smaller size.