Hi, Rusty!
I think that "the whole nine yards" means everything , the whole lot that is available?
It isn't a phrase that I have heard spoken though, rather that I've read it somewhere.
I don't know about its origin?
I'm thinking that if the Pine Cone is essentially a Christmas shop, it will remain exactly the same throughout the year? at least in its interior, where Christmas decorations are presumably sold?
But what about the Christmas trees - there will surely be no market for those now until next December?
You will know more after your visit tomorrow!