Boxing day is the day after christmas.
It's not really celebrated in the US. My family is 2nd Generation from the UK. The family gets together and have our big meal on the 26th vice the 25th.
If you want to know more though
Somebody else on reddit agrees with you
You can actually get an officer's coat like that at your local army surplus store. I picked one up that is very similar to the BB one in mint condition for $150. It's melton wool instead of cashmere but it's much much more durable.
People definitely line up in Canada.
FYI I just got a targeted mailer from BB for 40% off any single item. There were two coupons enclosed, one men's item and one women's item. Sale is in-store only and goes from Oct 15 to Oct 24 in US and Canada.
"Not valid on Red Fleece merchandise and applies to select watches and select Brook's Brothers shoe styles only"