>>3065815While they do seem a bit big, there could be a reason for this outside of design choice. One reason maybe horse back riding. Have you ever seen shadow of the colossus? The way Wander's legs flop about because his model is too small for the horse (or the horse is too big). Nintendo may of given Link wider hips in order to make him look less weird on a horse.
My personally theory is still, Link will grow up in botw. The whole lower half of his body looks too big for him. Like a kid/young teen running around on adult legs. This game seems like nintendo's way of finally getting to do all the zelda things they wanted to in the past. Its known that Nintendo wanted to have a zelda game where Link slowly grows up as the game goes on. Which seems really fitting for a world this big.