When I was in 1L, the Mcgill admin had this brilliant idea of telling all of us stressed out 1Ls that they had a "surprise" for us. We left our midterms and crammed at the SAO office and were given our Letters of Intent that we wrote the year before. As McGill advised, it was to "remind" us of why we chose to come to McGill and to inspire us during a rough time. Mine had a couple of exclamation marks added, a question mark around a particularly humanties-style statement, with a big ol' SP! and circled word.
I'm getting at exactly what @chaboywb wrote - they may or may not notice but it didn't matter in my case as I was accepted without any issue.
If you have a place to store your suits in the office, you could just leave all your stuff there and wear normal clothes into the office, as long as you can get there before the partners... may not be possible.This way, your suits never even have to go outside, though I hear this can cause Vitamin D deficiency in your suits
For myself, as others have mentioned, I have a pair of boots I wear to and from my vehicle, then change into my work shoes. I have a nice long waterproof overcoat, respectable-looking scarf and toque (some people go with ear muffs that wrap around the back of your head but not really necessary for bald folks like myself), and leather-ish gloves (I think they're pleather but nice and warm!). All of my outer gear is some form of grey or black so regardless of my tie and suit colour, it all matches somewhat, not that that's really necessary when trudging through the snow and mud.
Also, just a heads up, some dress shoes don't have grip (is it some or all?? no idea) so the second it snows, it's like being bambie out there. First time I went walking in the snow with my dress shoes, I didn't realise this, stepped off a curb onto a road with a slight angle, and almost did the splits; really messed up my groin for a while. Point being, it's a good idea to have traveling shoes anyways.