True to measurement if you have pain and plan on wearing them for the entire session otherwise you'll be constricting blood flow. I also have a pair sized down but I only use those during heavy overload periods in conjunction with my slingshot to avoid my elbows from snapping
but ya jay if you measure say 14 in go for 14 or if you measure 14.5 still go 14 but anything over 14.5 even 14.75 go 15" otherwise you'll be wanting to take them off between every set. They also don't stretch out over time and some people buy small thinking they will which is a huge mistake my buddy did that and threw them in the garbage after 3 months (he's got tiny elbows wasn't gonna fit anyone besides a chunky girl lol)