Another great blog for tomboy fashion is http://wearingthepants.tumblr.com/. (Pic below)
(pic above) http://orignauxmoose.com/fashion/casual-tomboy-perfection/
The glasses in the top picture make me wish I needed glasses. Damn you 20/20 vision. I remember as a little girl I loved glasses so I would always try and cheat in the eye exame. I would start to feel guilty about cheating and let the doctor know I was lying. I was easily guilted as a child.
Diane Keaton in Annie hall is a good example of the tomboy fashion.
I like the boyfriend fit slacks along with the long oversized mens dress shirt. It looks best if the dress shirt is tailored in a bit so as to not appear frumpy. Also the cardigan or blazer work nicely. Try mixing and matching the larger tops with skinny bottoms, such as skinny jeans, and the larger bottoms with more from fitting tops. Some can pull off wearing a large top and bottom but usually it comes off looking frumpy unless you are really tiny.