It’s only part of your job to look professional if that’s what the job is about, and very few of them are. The percentage of people who should dress “professionally” (read: the exact correct number of mm material in their pant legs), even when dealing with the public, is very, very low. Think about all the people you interacted today doing your daily routine and if you even noticed if they were wearing pants let alone the tailoring. I can honestly only assume the guy behind the counter of the gas station was dressed from the waist down when I paid for my gas yesterday. And anyone who gets paid is a professional, whether they look like it or not. You’d be surprised how many cancer researchers and police detectives wear jeans.
Not many promotions come by way of dressing better than your competition, unless that’s your job. It’s incredibly rare for “all things to be equal” and for the decision to come down to something like that… in fact I’ve never heard of happening at all. I didn’t get passed over for the accounting job because my tailoring was not perfect, I missed it because the other guy was either a better accountant, knew the boss, or simply had more experience than me - and that’s the way it is in most any industry 99.999% of the time. It’d make so much more sense to work on doing your job better than worrying about looking better during coffee break.
I believe the exact fit of someone’s clothes is a very petty thing to hold against them. Realistically, if someone is 20lbs overweight that should speak volumes more negatively about them on a much more relevant and personal level: uncaring or ignorant about health, foolish food choice decisions, inability to control their basic urges, indiference for their future well-being, inactive lifestyle, probably lazyness as well, and so on. Now if I were to actually believe these things to be true just from looking at someone who’s butt is too big and start complaining about them, I’d become pretty unpopular very fast and rightly so (FTR I don’t make any such assumptions).
I guess a person really has to be sitting in a pretty luxurious position if they can can judge someone’s worthyness and pick and choose who to deal with based on the cut of their pants. To me such tastes are fine but ought to be left in the realm of the mind and seldom if ever brought into the real world in decision-making. I sure wouldn’t pass on medical treatment while laying in a hospital bed because the doc’s socks show when he walks… nor would I pass up a good mortgage rate being offered to me if the guy has an extra 1" of clearance above his shoes. Hell, I wouldn’t even care if my 20 year-old waiter’s pants aren’t quite right; it doesn’t affect his ability to take my order or refill my drink, does it?