Well, if you are pushing your inflatable kayaks along the road in a wheelbarrow then pants are
definitely optional
I normally wear neoprene long pants on most paddle legs, I have a set of neoprene bottom/lycra front shorts for hot races.
for shirts I am allergic to wool so I can't wear the Icebreaker shirts that are very popular. I normally go a dry-weave long sleeve trekking shirt for the trek legs, and a synthetic sports shirt on the bike.