As far as I know, nobody does it, yet. Only very few people have made it, and each one by itself.
I have been researching the jacket. My intention is to have drafted a pattern by the end of september, and then hire a seamstress to make a number of them before the end of this year.
Myself, I want to have mine ready for a visit to Finse, Norway at the 30th anniversary of the filming of the outdoor scenes.
Corellian Exports has made the badge that goes into the chest pocket, but I have not found a source of the comm pad on the left gauntlet, so I will be sculpting that one myself and then get someone else to cast it.
The gloves without the comm pad are only grey leather welding gloves. They are plentiful and cheap, but often made from very poor-quality leather. I got mine for 2 £ / pair (!), but had to buy three pairs to get one that was good enough, and I had to replace parts of a cuff with material from another one because it had print on it.
The last item unique to the Snowspeeder pilots is a fabric helmet worn underneath the hard helmet. The rest of the costume is a normal X-wing pilot costume, except that neither the white wrist comm pad or "arm tools" are needed.
I think that the best forums for the Rebel pilot costumes are the
Rebel Legion's forum, and
the Ultimate X-wing Pilot Thread on this forum.
There can sometimes be a lot of activity going on in regional Rebel Legion bases and outposts, including group-orders of costume parts, so I suggest that you also check out the msgboards for those Rebel Legion units that are close to you.
Edit: DAVIDYR1 may be doing a run of jackets in the near future. So far there is only
the research thread.