The second-hand store, "Second Tyme Around," is having a "White Sale." I thought their window merchandising was a fun illustration for their sale.
According to Wikipedia, in 1878, John Wanamaker of Philadelphia department store fame decreed January to be the time for a white sale. Bed linens, which were available in white only, were sold at a discount. It is believed he might have done so to keep linen makers in business during a slow time of year.