How do I choose size 3 correctly, and what should the fit feel like?

Size 3 is one size in a range, not a universal clothing size. The correct size depends on your body measurements, so use the manufacturer’s or retailer’s sizing guidance for this Fosta model before ordering. Choosing by guesswork can lead to a corset that slides and supports unevenly, or one that presses into the ribs and underarms.

When trying it, fasten it loosely first and then increase tension gradually. A useful fit gives even contact around the back and sides. Your shoulders should be drawn back and your chest should feel more open, but your breathing should stay easy and your arms should move freely. There should be no sharp pressure under the arms, along the ribcage, or at the lower edge.

It is worth checking the fit in the position where you will actually wear it, such as sitting at a desk. The corset should stay in place while you work, not slide up or need constant adjustment. If it leaves deep marks, causes numbness or tingling, or creates pain, loosen it or take it off. A posture corset should be noticeable but not uncomfortable.

Do not wear it over skin that is irritated or has a rash. Consult a specialist before use if you are pregnant, have a chronic condition, or take medication.