This is one link that I found really helpful. It was straight to the point and sounds extremely logical.

Ignore the part in the second part if you want, because there’s some marketing talk. Otherwise, it could be a good guide if the store is near you and hence you can go try out the attire mentioned to see if it works for you.

http://www.active.com/story.cfm?CHECKSSO=0&NUM=0&CATEGORY=activeinsider&STORY_ID=13800

Another blog where I read that was interesting, mentioned this theory about our feet and hands being less critical parts. So when the body goes into the instinctive survival mode, it provides heat to  the vital areas which is the area surrounding the organs.  Hence our body is last to feel the cold.

Often enough, we would put on way too many layers for the body, neglecting to have the right gloves and socks that would keep our feet and hands warm. Since there is only that many layers (I assume max of 2) you can put over your hands and feet go invest in – one that wicks moisture away and another that provides the insulation. Don’t underestimate the below zero temp up and around the summit.

The other vital part that we often neglect is the head. In that crucial period when we are trying to forge forward with each step, the last thing we want is for the brain to feel sluggish and sleepy due to the cold. So get the neck and head warm.

Another link that I liked and placed here (thanks Ultimate Kilimanjaro  !) is :

http://www.ultimatekilimanjaro.com/blog/2008/02/dressing-for-kilimanjaro/#comment-11