Use the "Size Up" Technique for Knitwear

Vintage knits often run 15–30% smaller than modern equivalents, making the “size up” technique essential for a perfect fit. Wool and cotton sweaters from the 1980s, for instance, have a typical chest measurement of 38 inches in a size large, while a contemporary large measures 42 inches. By trying on two sizes larger—and measuring the garment flat—you avoid the shrinkage trap that ruins 60% of vintage knit purchases. Always bring a tape measure; your future self will thank you for the tailored look.