Instructions
Get to know Barbie's history so that you can have a better idea of what clothing the doll might have worn at different points in time. The 1959 debut Barbie was packaged and sold wearing a simple one-piece swimsuit, whereas in the 1970s Barbie was available in an array of outfits, such as bell-bottomed pants or metallic jumpsuits.
Browse a local library for old toy catalogs or buyers' guides. This helps you locate images of vintage Barbie clothing and identify a time frame within which it was released.
Check the fit of vintage Barbie clothing on a current model of the doll. Vintage clothing is likely to fit loosely, since modern Barbie dolls have a slimmer, more elongated body than those of the past. While the clothing's retro styling might give a clear indication of its age, this fit check might further help you determine whether it is actually vintage.
Look for a "Made in Japan" label on the clothing. Early Barbie threads carry this marker.
Find out if the vintage clothing was ever tagged with a cloth fashion label. If it was, it was released prior to 1972. This information should help you narrow down a possible year of production.