Authenticating retro graphic t-shirts and denim jackets requires analyzing neck tags, seam stitching, and federal registration numbers. Here is your definitive checklist.
1. The Single-Stitch Test for T-Shirts
Prior to 1996, most t-shirts produced in North America were finished with a single row of stitching across the sleeve cuff and bottom hem. Modern garments use double needle parallel stitching. If a shirt has a single stitch, there is a 90% probability it was manufactured before 1995.
2. Looking Up RN (Registered Identification) Numbers
Every US garment manufacturer is assigned an RN number by the Federal Trade Commission. Look at the care label or neck tag for "RN#".
- RN 13670 to 30000: 1950s - 1960s production.
- RN 30000 to 60000: 1970s production.
- RN 60000 to 90000: 1980s to early 1990s production.
Look Up RN Numbers Online
Access the official Federal Trade Commission RN Database to verify company history.
3. International Ladies' Garment Workers' Union (ILGWU) Tags
Look for red, white, and blue ILGWU tags inside coats or dresses. The scalloped circle logo with a needle and thread guarantees production between 1974 and 1995.