Measure for a one-piece teddy
Use the brand chart and check the length as well as the width.
Take relaxed measurements
Use a flexible tape for bust, waist and hip as directed by the brand. Keep it level, and write down the units. For torso measurements, follow the brand’s start and end points rather than comparing measurements taken different ways.
Check which parts adjust
Adjustable shoulder straps change how the top sits. They may not add room at the hip or through the lower torso. Check the garment opening, any closure and the full torso measurement if the maker supplies one.
Ask before choosing between sizes
A one-size label and an S–XL range can describe the same storefront variant without supplying exact measurements. Ask for the measurements, check returns before opening, and compare charts for each brand separately.