I want her wardrobe!

Summer Finn has one of the most adorable styles I've seen. Her clothing is fine vintage, full of inspiration from the 50s, 60s and 70s.

The costume designer Hope Hanafin says that when choosing costumes, she wanted something that was beyond the style "secretary wearing Prada", so she sought clothes that the character could actually buy with her paycheck.

That must be why '500 days of Summer' has become a reference! There are many websites that talk about it. For example, this, this, and this (this girl also recreated some clothes from the movie!)

The blue palette of the clothing and accessories was a requirement of the director, Marc Webb, because of the amazing blue eyes of actress Zooey Deschanel. Only Summer uses blue. The only other place where the color blue is used is in the dance sequence, after Tom's first night with Summer. Everything becomes kind of a reflection of his love for her.

I particularly loved the choice of blue, it is one of my favorite colors! :-)