Hi Taesung,
1) Battle of the Bulge - what he surely was wearing :
- definetely the same black panzer uniform, with Obersturmbannführer rank + RK with oak leaves + other decorations particular to Peiper - as in pictures of 9 november '44 taken in Westphalia. I'd go for the black ss pz side cap as headdress.
- Gebirgsjäger or mountain boots, perhaps with privately purchased gaiters (I think in one of the pictures of 9 November 44 you can see a small strap + buckle on top of one of the boots.
2) I think the first photo in your post above was certainly taken not long after the november 44 pics, and he has the same binoculars as in Hungary. So logically if it's not a picture of the Ardennes, then it's close... a matter of weeks.
We have no confirmed pictures of Peiper during the BoB, and as we live now, today, I'd say go for the first picture if you want to sculpt Peiper in the Ardennes ...
Is that really a long leather coat you think he's wearing in all three pics ? Not a grey U-boot captains coat ?
btw If there would be another Peiper figure in the Alpine range, my personal preference would be for one in 1/16 scale in the black uniform of an ss panzer lt-colonel as in the pics of 9 nov 1944 (you could still say with 100% justification it's Peiper during the BoB ! as he did wear this uniform underneath either a coat or a flying overall ) - in that scale you could do a great study of the face and try to get a real good likeness of the man. But that's just my personal preference of course ... just some wishful thinking, sorry
hope this helps, and wishing you and the other guys at Alpine a very happy and prosperous 2013 !
Johan