The measurements provided below are for the actual pieces, not your body measurements.
For the trunks, we suggest you measure a pair of non-stretchy shorts or pants that fit you well. For the hip measurement go 8" down from the waist and measure there. You can then compare to our size chart and choose the proper size. The fabric for the trunks have no stretch to them other than at the back of the elastic waistband.
The tops are cut a little on the generous side. Depending on your shape, most find they are not totally form fitting which was the intention.