Good info Sixty Fiver. Since people and conditions vary you may want to add a piece about what you wear in what temperatures. It doesn't have to be name brand specific, but something generic.
Also a brief write up of why layering is your friend as well as why certain things are good in principle, but won't necessarily work in practice. For example why plastic coverings can keep you colder or fabrics that don't let your skin breathe or are to tight will keep you cold.
Very nice, and simply done Sixty Fiver.