I like the gingham shirt with the plaid tie. There is some old rule of fashion that states you are not supposed to mix and match patterns. This rule has been superseded. You should feel free to experiment with mixing and matching different kinds of patterns and textures, and as you can see here, great results are achievable. The trick is to go for complimentary colors and differing scale of patterns.
I'm also a fan of the layering of the vest and sweater. Libraries, classrooms, and offices can get cold. It is totally acceptable (and advisable) to keep a tasteful sweater handy if you find yourself in such a situation.
Nail a look like this at your next study group with the cutie from Civ Pro and you will give new meaning to the term "hornbook".