Dating vintage clothing guide
Lot numbers on vintage clothing labels were used to process and track garments as they were produced in factories.They ceased to be put on labels since 1979, so this will put you on a closer track to dating an item. Although you can buy modern clothing that was made in Mexico, vintage clothing made in Mexico is most likely from the 1950s as travel to Mexico was quite popular and Mexican styles, particularly circle skirts, caught on as a trend.The best rule of thumb is that if an RN number is 6 digits can be aged from the 80's, while numbers of 5 digits can be dated around the 60's and 70's.So, for example, an RN number of 17272 would put the garment in the mid 60's.
Acrylic was first used in 1950 and goes by the names of Orlon, Acrilan, Zeran and Creslan as well.
Thirdly, look for a boutique's address on the label with an absence of a zip code.