I hate the BMI; grew up being told I was dangerously underweight and unhealthy (despite doing track, rugby, heavy physical labour etc), which really helps when you are an already shy teen that lacks self confidence. It's an overly simplistic system based on weak science that is misused all the time. It only applies for a specific body type, doesn't work for anyone that is naturally wiry, heavily muscled, or other similar variations.
I assume the uniform is tailored to fit no one well; usually have to go up a few sizes of pants for it to fit on the legs, so looks wonky even after some tailoring, and the shirts aren't any better. Not sure how they manage to be hugely loose around the waist, big around the arms, but tight on the shoulders and riding up the armpits. Their virtual models must have some really weird proportions not found in nature. The only thing consistent about them is that they never fit well. Really weird when I can normally buy off the rack stuff no problem and not need any tailoring (with the exception of non-tapered shirts). How people look in uniform should taken with a grain of salt as they make everyone look terrible.