you mention that our ds does scouting.
scout trousers are perfect to walk in, they are loose, so trap a layer of air for warmth, and dry quickly if wet.
also, what does he wear on his feet for scout hikes? They may be good enough for bronze.
ds has done bronze and silver.
he only took the clothes he was wearing, plus change of socks, plus decent waterproofs
blister packs essential, plus enough dry socks for each day.
ds insisted on taking a rollmat, as he didn;t sleep at all without one.
they were frozen on both bronze practice, bronze trip and silver practice, only decent weather was silker trip. (these were June/sept and oct)
ds was the only one not cold at night becuase he has a 3 season bag, but it isn't very light.