Always order up with G Star! I am a 25 or if a jean runs big I get a 26. I'm 5'9 125 lbs, both consistant. Waist 25" hips 35". In all Gstar I am a size 27! If you are an in between like me 25/26 get the 27's. Reasons I love GSTAR! They are sooo soft and the color of they're jeans, always the best! Like a nice sheen to all the jeans, just beautiful material. And always some extra style comes along with them too.