Kristen was seen wearing this glasses, while strolling around LA with her puppy on July 28, 2013.
Glasses are branded Lookmatic Morgan and you can browse through Amazon for similar ones
The extremely cute baseball hat that Kristen is wearing is branded "Us versus them" as it says on it... you can find the exact one (just in black version) at Amazon
The purple tank is from Chaser Shop it here (similar version)