The old Lit Brothers department store (built and expanded between 1859 and 1918) on Philadelphia’s Market Street has a sign over one of its corner entrances, that has always puzzled me. HATS TRIMMED FREE OF CHARGE is embossed into the metal fascia of the canopy. It’s the only such sign. But whose hats, men or women? Did it refer to a hat bought in the store, or was it—as I suspected—an enticement to walk in and get your hat “trimmed,” whatever that meant? And why was this procedure so important—and so common—that it had to be emblazoned over the store entrance? The Internet has many references to the sign, but I couldn’t find an explanation. The closest I got was an article on how Stetson hats were made (John B. Stetson, a native of New Jersey, not Texas, established his factory in  Philadelphia in 1865). The original Stetsons were made out of felt composed of beaver fur. The last step in the manufacturing process was to sand the blocked felt to remove excess hairs. Did such felt hats require  periodic sanding and “trimming.” Perhaps.