I'm a huge fan of the college looks of the '10s to '50s, but I tend to go towards the more formal end of the spectrum when I go to class. I stick to the '30s-early '50s look most of the time, though I sometimes try to get an "Edwardian" aesthetic going. What I like most about the depression/WWII era in fashion was how the casual styles still had an elegance to them.
Probably one of my favorite looks of all time, the '40s "hep cat". These were the first pair of vintage slacks I ever bought. Hollywood waist, gabardine with exterior suspender buttons. A real bargain too at only $32, compared to the usual NYC price of $75-$100 for a similar pair. I've never owned a more comfortable pair of pants in my life. The tie is from around the same era and is one of my favorites of my collection. I recently started wearing suspenders again and I must say, not only are they more comfortable than belts, the keep your slacks at the proper drape length.