Below is are some comments from people who have been to Everest Base Camp and what they felt they could have brought after the trek.
1). Seriously, I had pretty much everything I needed, a down jacket with a matching down hood would probably be the height of it, my North Face one only had a fold away super light waterproof hood, non insulated. Also a pair of icebreaker long johns under my trekking pants. I’s also say bring vitamin C tablets which I didn’t have. Ray Farrell
2). Warm slippers (like those bubbly North Face ones) to wear in the huts at night time.
3). I think everything was covering in the kit list Ian, we also had some good discussion about gear and bringing the right stuff. Looking back I think I would have brought more snacks that I liked and brought more Jaffa Cakes!! Frank Wilson