This post was written by Lindy Shopper.

I hear a lot of questions about how to isolate the decade, or portion of a decade (or in rare instances, the year), in which a particular garment was made. How do you identify the date of a garment based on the details, fabrics, notions, etc. included the garment? My initial answer is to do your homework, but my learning mostly consisted of shopping for vintage with my mother, asking her to identify the decade, and having her point out different identifying details. I can’t loan out my mother to all of you, so you’ll have to learn the old fashioned way: book learning (or in the 21st century, the Internets).
Kim at Time Machine Vintage directed me to the Vintage Pattern Wiki to get some ideas for dresses, but I was delighted to see that you could search their extensive directory by the type of garment and also by year. I see other compilations of patterns for sale that usually group by decade, but I’m just anal retentive enough to want to add more mid-1930’s dresses to my collection, or to want to make sure that late 20’s/early 30’s dress is actually late 1920’s. Regardless of your OCD level or absence thereof, this website is a useful resource for anyone who would like to learn and understand more about the fashions from each of the swing era decades, down to the year. Another great feature of this site is menswear and children’s clothing included in the patterns, which is not something I run across very often.
Enjoy this resource, I’ve already spent portions of two evenings going through the early 1940’s stuff – this could take a while!
I learned a lot about identifying vintage styles from vintage patterns – I always did more vintage sewing than collecting real vintage (couldn’t afford it when I was 16!), so I’ve been looking at pattern envelopes for years. Pattern envelopes often have copyright dates or postmarks (mail-orders), which makes it easy to pin down which year it’s from – something that doesn’t show up in vintage clothing or home photos.
And yes, I’m totally OCD about that stuff too!