Unsure about how to dress up a t-shirt and jeans? Try to start with a t-shirt that has a little more luxe than just your average cotton/poly work-in-the-yard shirt. The neckline and seaming on this shirt are more flattering than just a regular t-shirt.
A blazer, a nice t-shirt, and some cool mesh heels all work together to dress up a pair of ripped jeans. Rolling the jeans at the cuff shows off the shoes. (Make sure when you roll your jeans that they are slightly baggy in the thigh and leg area. Rolling up tight skinny jeans with this mesh shoe would just ruin the whole look.)
Add some jewelry with cool shapes to help take the look from basic to interesting. The gold cuff would have been just a normal cuff had it not been folded back on the sides.
As you know (or maybe you don't) I sometimes like to add a little bit of the unexpected to my looks. The ripped jeans may not seem like they are appropriate for a blazer but adding at least one edgy or unexpected item to your outfit usually works. The mix of tough girl and classic elements works for this look. Try it sometime!