What size hollister jeans do you need if you measure 29 waist and 38 hips?

It would be slightly dependent on how tall you are, but with your measurements I'm sure a 'size 0' would fit you quite snugly. If you're going for a baggier look then a 'size 1' would be better suited. I have a 24 inch waist and 33 inch hips, and a 'size 2' from Hollister are kind of baggy on me.