Keep the measuring tape level and firm Measure from the back of your head bringing the ends together at the center of your forehead right above your eyebrows Use the big hat size chart below to determine your size (popular big head sizes include 7 3/8 hat size, 7 5/8 fitted hat, 7 3/4 hat, and a size 8 hat) rounding to the nearest eighth of an inch as necessary. Vintage Orlando Cubs MiLB Fitted Hat 7 3/8 Regular price $4000 Sale price $4000 Sale Default Title Quantity must be 1 or more Add to cart Buy it now. Browse New Era Fitted Hat 7 3 8 and more from your favorite designers at Grailed, the community marketplace for men's clothing Shop our curated selection today!.