I would size down since they have spandex for stretch. Happy that there are no belt loops or back pockets - the entire design of these pants is to provide a smooth and sleek fit, thus any extra fabric or detaile (lke belt loops, extra pockets, etc.) defeat the design purpose of this item. Love love love the fit and - so much more complimentary than the heavier and detailed other jeans on the market! These are very slimming and go well with any top with no bulk!!