I love this look because it is slightly unexpected, I like the contrast of pairing a very casual item (sweatpants) with a much more formal one (blazer). The key, in my poinion, for making this look work is in the proportion, fit and overall silhouette. Everything is form fitting and as such doesn't look (TOO) odd together.
I was pleased with the ensemble as a look.
Again I'm wearing loafers, these are without a doubt, my favourite style of footwear I find them to be extremely versatile and very flattering, even with my generously wide *cough* CLUB *cough* feet!