This tailor comes from the era when men’s tailors were called
Haberdashers. That’s not a phrase you hear very often anymore. Until the 1980’s most men wore hats or at least owned a few dress hats.
It's striking how much our dress code changed in such a short time. My own father's idea of "casual" was dress slacks and button down (dress) shirt. In the workplace, it was a full business suit with vest and yes, usually a dress hat. In his era, no grown man would be caught in public with dungarees, sneakers and t-shirt.
Similarly, the women all wore dresses and skirts. All the time. A woman with "pants" was somewhat scandalous.
When JFK did his 1961 inauguration without a top hat, that was when everything started changing. The Beatles accelerated that further but even in the early days of the The Beatles (and Rolling Stones), they were outfitted in suits.