It was 1975ish, so a bit more than 30 years ago but Hudson’s Bay sounds right to me. That store was a much bigger deal in the 1970’s. My family always had their blankets kicking around.
Before 1991, the Queen St store was actually part of the Simpson's department store chain.
The Simpson's Christmas window displays were much more extensive as well.
Back then, the family could have gone down into the basement of the Simpson's department store and dined on hot dogs and an orange-Tang-like drink (there may have been other flavours, but I always chose orange). The drinks came in paper cones (similar to those used for water coolers) placed in metal holders.