Well, I realize that this thread is now quite old and obviously no one has posted in quite a while, but this year I'm determined to put this cosplay together for some conventions. I was able to find a quite good "close enough" pair of PJs on ebay - the brand is Christopher Hayes (which apparently used to be Macy's in-house brand). The tag from Macy's looks quite old - yellowed even. So unfortunately I have no idea when these things were available new, but they were still brand-new in the package when I got them.
Here's the picture from the ebay listing - if anyone is interested, I can post some actual pictures of them outside of the package (and the whole outfit together once the dressing gown arrives):
The only downside was that they are size XL so they are pretty big on me (I really should be wearing a Medium), but not so much of a big deal since I'll have the dressing gown over it (and I may very well take in the shirt myself to make it less gigantic). The thing I found out after I bought them is that the originals did not have the "suit-style" lapels collar, it looks more like a regular dress shirt collar. But I'm not too concerned with that, considering how difficult it is to even find a "close enough" pair...
As far as the dressing gown, again I found one on ebay for a discounted price, which is a Howick plain piped towelling robe. They come from House of Fraser, which can be found here:
http://www.houseoffraser.co.uk/Howick+Plain+piped+towelling+robe/197921858,default,pd.html
This thing looks damn near perfect to the original!



Let me know if anyone wants to see shots of this once it comes in and I can put the whole outfit together
