The size of a swimsuit is determined by both height and chest circumference, as follows:

Height: The swimsuit size is selected based on height. S is suitable for 155-160cm, M is suitable for 160-165cm, L is suitable for 165-170cm, XL is suitable for 170-175cm, and XXL is suitable for 175-180cm.

Chest circumference: Chest circumference is also an important reference factor for swimsuit size, and different styles may have slight differences in the choice of chest circumference. Generally speaking, 77-82cm is suitable for size S, 82-87cm is suitable for size M, 87-92cm is suitable for size L, 92-97cm is suitable for size XL, and 97-102cm is suitable for size XXL.

In addition, waist and hip circumference are also factors to consider when choosing a swimsuit. If the waist circumference is thin, you can choose a swimsuit of the appropriate size, but if the waist circumference is thick or the hips are full, you may need to choose a swimsuit one size larger to ensure comfort and fit.

In short, when choosing a swimsuit, it is important to consider multiple factors such as height, chest circumference, waist circumference, and hip circumference, and choose the appropriate size and style to ensure comfort and fit. At the same time, attention should also be paid to considerations such as materials and brand reputation to ensure safety and durability.