>> I have Goosefeet down pants that weigh 7.3oz with about 3oz of down. They are lighter, cheaper, pack smaller and warmer than the cocoon pants.
I like mine, but haven't used them much. I tend to wear rain pants when things are a bit chilly and just go to sleep when things get really cold. I haven't done much shoulder season backpacking. As to the size, you could probably get away with a medium for the man, but I would go with a large. I have a medium, but as a 6'00" guy, I have an unusually long torso. I'm also pretty skinny and there isn't a huge amount or room on the waist (although I think you would fit it just fine on every day but last Thursday). So, unless you want to have it be above the ankles a bit (which isn't the end of the world) then I would go with a large.