Do a tumblr search on libraries, you won't regret it. So much old school cool. I kind of wish I had a room big enough to turn into a vintage library. I certainly have enough tons of books for it.
Y'know, a place to wear an evening gown, a fez and pretend to smoke a pipe as you flip through Gøran Niklasson's timeless work "Alt om spadar".
Or chat with your audience, like Niklas in
Regular Ordinary Swedish Meal Time.
Actually, instead of "evening gown," you may mean
"smoking jacket." In U.S. English, evening gowns are what Disney princesses wear to balls. (Although if your favorite outfit for a cozy evening at home is the side-slit, ice-blue satin number Elsa wears in "Frozen," I won't judge...)
If the menswear look is not your thing, how about a loose, flowing, easy yet luxurious
tea gown?
As far as "slippers," in U.S. English they are generally the bedroom kind. I own
these. You probably want the
Sherlock Holmes kind, exotic Persian slippers.
In Hawaii, where I grew up, "slippers" --
or rather, "slippahs" -- refers to the universally worn rubber thong sandals, or zoris. (Called "flip-flops" here on the Mainland.)
Yikes, I let the fashion-history-geek side of me out too far! But for those of us in the Northern Hemisphere, it's getting to be pipe-and-slippers by the fireside time.