1910 to 1919
Most modern men would be lost in the second decade of the 20th century, at least when it comes to fashion.
A gentleman's casual attire typically consisted of a three-piece suit, which included cuffed trousers and a stiff, detachable collar on top of a sack coat, which was a loose-fitting, single-breasted jacket. Consider the sack coat the forefather of all our modern suit coats, from the tuxedo jacket to the sport coat. Bowler hats and bowties were all the rage, and this was also the decade that wristwatches made their debut.