Alexa wore a denim dress (not sure if it's a dress or playsuit tbh) with lace-up espadrilles, and a python print bag.
Get a similar denim look with this denim playsuit which is just £9.00 at New Look.
Pics from Zimbio

Alexa Chung snapped outside the Chloe Spring/Summer 2011 Show during Paris Fashion Week.
The crème de la crème of style stars were out for the reopening event for New York's Chanel Boutique on September 9 - all showing off designs from the brand.
Sarah Jessica Parker donned a black-and-pale pink Resort dress topped with a glitzy jacket from the brand.
Alexa Chung also looked fab in Resort Collection in her little monochrome dress.
Rachel Bilson went fringed in Fall 2010, plus black ankle booties.
It was a little black dress from Leighton Meester, paired with a bold statement necklace (also from Chanel), and ankle-strapped heels.
Putting on her best model pout, Karolina Kurkova posed in a silky white top and high-waisted black pants.
Alexa Chung was out for the launch of Levi's new Curve ID jeans range at Studio Valbonne in London last week.