My selection of hats is limited to one pitiful layer of fleece. I was totally unprepared for the arctic chill that blasted the city—and my poor head! My first stop was Bird in Brooklyn, where I spied this mod hand-knit cap by Tsuyumi, $126, tucked away in the back of the store. The small brim was snappy, and the gold acorns in the front were unexpectedly fun. Though most knit headwear looks lumpy or shapeless, this hat kept its firm, comfortable form. But the navy, yellow, and white color scheme looked just like my high school’s marching-band uniform. 220 Smith St., at Butler St., Cobble Hill, Brooklyn; 718-797-3774.