The Sartorialist is a very popular website. Scott Schuman gets an average of 2+ millions of visits per month to his website. He lives in New York and makes street photos of people that are well dressed or interestingly dressed.
Sartorial: about a tailor or their trade. A tailor is a person who makes, repairs, or alters clothing professionally, especially suits and men's clothing.
He has done many YouTube videos, but in this video Scott explains how he became so popular and how the blog drives his business.
The Sartorialist's Guide to Fashion Journalism
Scott did many other YouTube videos like: http://www.youtube.com/watch?v=e5NgG5koPZU
Note that all of this is possible because of Scott's fashion expertise.