I wanted to correct this because it seems I misrepresented him a bit. Sorry for the misinformation everyone.
Not sure why such a coupon is only going to certain customers, but it's how BB wanted to do it...
I spoke to my SA in Toronto and according to him it's a one-time use code not a generic code that can be reused multiple times/multiple people. He also does not have the code at the store as the letters were sent out from the head office. Take that with a grain of salt.
Would the 15% for opening a Brooks Brothers credit card stack with the corporate day discount for a potential 45%?