I'm thinking of buying these Boden dresses for summer (or at least one of them). But I'm wondering about sizes. The size chart suggests I should wear a US 6, but I normally wear US 4. Do Boden sizes run small?

http://www.bodenusa.com/en-US/.....vGroupID=4 (in plum piazza)

http://www.bodenusa.com/en-US/.....vGroupID=4 (in storm leopard or fatique alium)