As explorer says - crampon compatible boots - pref B4s as you will be ice climbing in them.
There are refuges along the way to stop for a rest and change your gear if you need to.
At the start of MB you will be walking uphill at a good pace for someway - so you'll be hot, so something light and breathable for walking, with a decent waterproof (trews and jacket) for the occasional rain. A decent walking pole comes in handy especially over the rocks.
When you hit the snow layer, you will want crampons, so make sure you've got tough gaiters to stop yourself ripping bits out of your trousers.
Once you are in the snow the ice axe comes in handy, and then again when you are climbing. If you haven't already got your helmet on, best put it on now.
As it gets colder you will want hat / gloves / warmer layers - although I found that I was so hot with climbing that I didn't need them - until I stopped of course.
On summit night it will be cold, very cold, but you will also be moving fast, so be prepared to layer up or down quickly, especially if you stop for water. Down is best as its light and warm.
Moving up to the summit you will be mostly walking, so mitts are good for keeping your hands from freezing.
Any camelbaks will freeze regardless of how well you insulate the drinking tube, so take bottles and insulate them if you can in your pack.
Don't forget your sun cream and your glacier glasses and maybe a camera to record the event.
Your pack needs to be big enough to carry up everything you are going to wear / carry on your summit attempt, so probably 35-40 litres is enough.
As you are carrying it a long way and on some steep climbs it needs to be comfortable and with not too many bits hanging off to catch on the rocks - proper climbing bag is great but whatever works for you will do.
Its a one-off bounce for the summit, you wont go if the weather isn't right so try not to include a bivvy and the cooking gear in case you get stuck in the weather.
As you are carrying your kit all that way, go as light as you can - but to be honest a few grams isn't going to hurt you - its your fitness and the mountain that will hurt you, so the best things you can take with you are experience and many many hours of hill / mountain training.
Good luck.