Below is a brief description of the gear that worked for us, but please remember that there are plenty of alternatives. All your gear needs to be tested in snow and cold before you arrive at Everest. Walk in your boots, sleep in your tent and try handling gear with the gloves on.
Stuff will be provided for you if you are joining a commercial expedition. Check carefully what they will bring. Also check if it is for your personal use only or to be shared with other climbers. Get it in writing.