Girdles are supposed to be skin-tight, but they should not make you feel uncomfortable or restricted. The reason why they need to be well-fitted is so that they can offer the best effect on the clothing that you choose to wear over it. To determine the right fit, walk into any store by a reputed brand and ask for fittings. Check various options and try to wear them under your clothing to get an even better idea. The result should be one that offers you great comfort without making you feel sore and allow a little bit of wriggle room too.