Try It On
Whenever possible, try on any vintage garment before purchasing. Vintage sizes DO NOT correlate to modern ones, so you can't just grab "your size". Also, the body shape types that were dominate in previous decades are not the same as the ones women have today. The best way to know if something fits you well it to put it on.
Measurements, Measurements, Measurements!
It cannot be stressed enough how important it is to know your size measurements. At the very least, every good shopper should know their bust, waist, and hip measurements. This will come in handy especially if a vintage retailer doesn't have a fitting room or if you purchase vintage online.
Double It
A general rule of thumb is to double your regular size to get your ideal vintage size. So if you wear a Gap size 6, your size for anything made before the 90s will be around a 12. This doesn't mean you don't have to try things on, but it's a good place to start.Keep in mind that there is no reason to worry about a bigger size if the fit is correct and flattering. If Marilyn Monroe was a size 12, what does it matter if you're a size 10?

