In reply to dropping_bombs:
Some great advice so far, I often joke that the only true travel esentials are a tooth brush and a credit card. Credit card on the basis that you can basically buy whatever you need extra. Though I guess ISM may be a pretty full itinerary.
Lots of long sleeve wicking base layers are always useful, and you can always layer them up a bit. You can always roll the sleeves up, where a short sleeve is much less versatile. I always take an stuff sack for isolating worn base layers from clean, as synthetics stink!
I took pac lite type waterproofs to the alps, but they never really got used, soft shell was fine mostly with a hard shell for emergency use. Very old school, but I always found "Powerstretch" leggings useful. Comfortable, very quick drying and still warm when moist. Though lighter softshell trousers are the later equivalent I guess.
Boots are probably the most critical item, make sure they are broken in and comfy well in advance. Also worth being sure you have a good streamlined climbing pack that you are happy climbing in. (Small number of blister patches and some microporous tape just in case).
In my experience (limited) Alpine like Winter climbing is something you do in spite of your gear, i.e. You seem to spent a lot of time being too hot, then a bit cold. Rucksacks get in the way etc etc. I guess what I am saying is it's better to show up with slightly tatty stuff you have tried and tested together Hill walking in the UK than showing up with the latest set of Arc'teryx or Patagucci gear that are unproven.
Stomping up hill even if it's white on top is mostly a hot and sweaty experience. It's having additional layers for when you stop makes the difference.
A spare pair of gloves can be useful, as they can be slow to dry.
Anyway, have a great time!
Post edited at 18:25