My pick this week is Winter by LJcatfeather.
The suit is very well constructed, and things like the black panels seem, err, seamless. I love the little details (the boutonniere killed me). Mostly, though, I love how original the idea was. Her tuxedo really stands out among the (I admit, gorgeous!) ball gowns.
I do admit, though, that part of the reason that I'm picking this outfit is that I am highly biased and I think that in general, more people and more dolls should embrace the fact that suit coats are awesum.