JG garments are generally all oversize fit. The size your measurements fall under will be roomy, no need to size up. If you are on the cusp between sizes, sizing down is the best option. JG garments are usually quite multi-size: meaning you can jump around sizes if you desire a slimmer or roomier fit.
Refer to your own body measurements with a measuring tape to find your size. You can also refer to individual garment measurements (chest, waist, hip, sweep, length) using a measuring tape around or along your own body. Note, there is 1/2" sewing tolerance between listed garment measurements and sewn garment measurements. Length measurements are from neck point of shoulder to hem and found on individual garment listings.
If you fall above or below a current size range, send an email to email@example.com and your size can be drafted for no extra charge.