The never ending question...how do I make my butt look smaller?
Pants that have a lower rise tend to create the appearance of a smaller rear end, be careful not to go too low...because that's not attractive on anyone! Also opt for bottoms with a smaller plain pocket so you aren't drawing any added attention.
A wide waistband will help visually cut the posterior and give the illusion of a smaller backside.
If you are looking to minimize the maximus make sure the pants are a straight leg or a boot cut. This will assure that you don't look too top-heavy in skinny jeans.