Bulrush...

First and foremost, you are an example to these scouts, and if you show up with gear inappropriate to the siutation it sends the wrong message.

Cotton is not the choice for these conditions, period. You are asking for hypothermia, period. You get wet, you'll never get dry. Period.

As this is car camping and not lightweight backpacking, your local Wal-Mart should have very affordable options for rain gear and non-cotton long johns. Wool or poly socks, several pairs, would be good. Go to your local thrift and find a "beater" wool sweater, maybe even rain pants or nylon pants.

The suggestion of using a hot water bottle in your sleeping bag is a good one... I'd take up that suggestion. Also, socks in bed are good, but only if they are not tight fitting. Tight socks will shunt the blood out of your feet and make it hard for the blood to return, leading to cold feet and a miserable night.

Drinking warm drinks do not keep you warm... calories keep you warm. Warm drinks are more beneficial psychologically than anything else. Before you leave, go to the winter camping forum and scan back through the last few years worth of posts. This thread should be in that forum as well.

MNS