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I got the top hat and dinner suit from the Preview Program. I was in the second wave of people chosen on November
8th and I picked this outfit before the updates on November 19th. I
don't work for Microsoft or anything, I'm just a guy who got lucky in
the preview.
By the time all the Preview Program applicants were
let in on November 18th, all the special preview items had been
removed. The winter clothing we got this week was one of them, and it's
been reintroduced since. There were a bunch of other clothes, including
sports jerseys for a ton of countries, but they were all orange-starred
and were removed prior to the 18th.
I imagine all of these items
will become available to everyone within the next six months, just as
the winter clothing has, so all you need is patience and you'll get
this at some point before July, I think. I'm currently wearing a dinner
suit from the Dress Up feature and a top hat, which are both
unavailable as of this post, as well as boots and white gloves, which
are. There's also a monocle, but I can't remember if that was a preview
item or not. If I alter my clothing I won't be able to reselect it (or
at the least, this is what I assume - I daren't try it out), so while I
may be dressed up to the nines I can't slip into anything a little more
casual for a while.