I had forgotten to bring any thermals so was a bit brisk whilst cooking and chilling in my shorts. So I slipt in to my cumulus, hitching it up to walk about. I appreciate it needs a video, sorry to disappoint!
Anyway, so I had an idea. If it had a suitable double set of poppers down the edge for at least half the length you could wear them as trousers.
Is that a totally mad idea? Apart from looking like a complete dork, but who cares if you are warm, I can't see the problem at the moment.
Photo from the bivvy (hopefully)
https://imgur.com/a/6p6D5Ps