I’d say, like I always have with Adidas (even before I stopped selling it), to try it on. That’s why I will not buy adidas unless I physically try each piece on. Even if I’ve already bought that exact style in a different color. It happens way too frequently with all Adidas apparel. Case in point, the bookstore has a new(er) shipment of the gold GameMode polo in that fits totally different (smaller) than prior shipments, and even totally different than the white and blue Game Mode (exact same shirts, just different color) on the rack right beside them. I tried them on prior to the last home game, noticed the dramatic difference, even mentioning it to the gentleman working that day (he’s the only one I’ve ever found that’s knowledgeable about the apparel there), and he confirmed that some of the more recent shipments (replenishing current styles, not new styles) are “way smaller” than they have been.
So never buy adidas unless you try on. Or like to gamble.