Model Billy is 5' 10"/ 178cm, and weighs 159lbs/ 72.5kg, wears a size W30 Please use this info as a general guide as measurements are approximate. Size Waist Seat W30 30.7" / 78 cm 43.3" / 110 cm W32 32.7" / 83 cm 44.9" / 114 cm W34 34.7" / 88 cm 46.5" / 118 cm W36 36.7" / 93 cm 48" / 122 cm W38 38.7" / 98 cm 49.6" / 126 cm Size Front Rise Back Rise W30 13" / 33 cm 16.1" / 41 cm W32 13.4" / 34 cm 16.5" / 42 cm W34 13.6" / 34.5 cm 16.7" / 42.5 cm W36 13.8" / 35 cm 16.9" / 43 cm W38 14.2" / 36 cm 17.3" / 44 cm Size Thigh Inseam W30 27.6" / 70 cm 28.3" / 72 cm W32 28.4" / 72 cm 28.7" / 73 cm W34 28.8" / 73 cm 29.1" / 74 cm W36 29.2" / 74 cm 29.5" / 75 cm W38 30" / 76 cm 29.9" / 76 cm Size Length Leg Opening W30 40.6" / 103 cm 14.1" / 36 cm W32 41.1" / 104.5 cm 14.5" / 37 cm W34 41.7" / 106 cm 14.9" / 38 cm W36 42.1" / 107 cm 15.3" / 39 cm W38 42.9" / 109 cm 15.7" / 40 cm In order to best determine fit, it may be helpful to compare our garment’s measurements to a similar garment you already own. Lay your garment on a flat surface and take all measurements from the outside of the garment. Click here to check out our Garment Measuring Guide. ** If you are still confused, you can Contact Us to help you choose the size. **