Our suits are specifically chosen to ensure a good fit will be achieved from your measurements. However, we rely on these measurements to be reasonably accurate. When measuring ensure that the tape measure is snug around the body, not too tight and certainly not too loose - your suit has to be a close fit and yet comfortable. Don't assume that because you like wearing 42" pullovers then a 42" chest suit will fit, wetsuit sizing doesn't work like that - remember that loose fitting jumpers may be comfy but a loose fitting wetsuit will be cold!
Some sizes come in a Tall version, these suits have extra length in body and leg. 

In the event that you're not entirely happy with the fit of your suit it can be exchanged provided that it has not been used (please note that the cost of postage is not refundable).