Time is of the essence for firefighters. In old firehouses like the one at 1700 W. 95th St. on Chicago’s South Side, firemen would sleep upstairs and, at the alarm bell, zip down the fire pole, rev up the fire truck on the ground floor, and zoom out to extinguish the flames. Now that Optimo Hats, a manufacturer of luxury men’s hats, has moved their headquarters into the 1915 firehouse, things have slowed down a bit. The handful of hat craftsmen who work there can peek through