Pitti Uomo 90 – blue hopsack blazer On the second day of Pitti Uomo 90 I decided to wear the most conservative and classic combination of all days – blue hopsack blazer and cream mohair/wool trousers. Hopsack is a type of weave. There are different hopsack fabrics though as some are more loosely woven than others. Traditionally the loosely woven …