Rain and kinda cold -- what would you wear??

[ny biker]

I'm a ride marshall for a fundraising ride tomorrow. It's been raining here for days, and the forecast for tomorrow is temps in the mid-50s to mid-60s and:

"Expect the possibility of more flooding rains to only last through tonight. By Saturday, rain begins to wind down to more light sprinkles/drizzle or isolated showers."

I'm trying to decide what to wear. My Showers Pass jacket should be more than warm enough for my torso. For my legs, I'm trying to decide between Ibex wool capris or shorts under Sugoi Midzero tights. I know that in general the wool would be a good choice, but I'm wondering if a few inches of exposed lower leg will be enough to doom my feet to being cold despite wool socks and toe covers.

I also have a brand new wool cap. I'm trying to decide if I want to wear it under my helmet or if that would be too warm. If it rains hard, I can wear the Showers Pass detachable hood that I bought with the jacket, but I don't think that will be necessary.

I do have notes on what outfits have been comfortable (or not) in various weather conditions on previous bike rides, but the capris and cap are new so I don't know yet what conditions they're good for.

This is the cap (super cozy, I just might sleep in it on cold nights!): http://www.teamestrogen.com/prodIB_852.html

These are the tights: http://www.teamestrogen.com/prodSU_40311F.html

The capris are from Ibex, and I don't see them on TE anymore so I guess they've sold out.

I don't know yet if I'll be riding the shorter route (28 miles) or the longer one (55 miles), but even with the shorter route I expect to it to be a long day. I'll probably be stopping to assist other cyclists and take shifts at various corners where we want to have a volunteer to direct the cyclists.

Thanks very much for any suggestions!!