There are various online shopping venues that cater to the nostalgia and love for the 1950s style of glamour and dress, including eShakti and ModCloth. There are vintage-inspired pieces for any size and budget.
The first and most notable website offering great quality clothes is eShakti. Based in India, this company offers 50s-style dresses, tops and skirts in sizes 0-36, as well as offering the option of custom sizes based off specific measurements. The ordering process also allows shoppers to customize the pieces based on height, desired length, desired neckline and desired sleeve type. Customizations are less than $10, and the store offers exceptional sales and promotions, as well as a referral program.
ModCloth also offers a broad range of sizes, going up to a 4x, but does not offer customizations. They do have a lot of cute, affordable pieces available, including a section in which they add one vintage item daily.