It will be cold and rainy in London, so layers are key, and good walking boots that will keep my feet dry while seeing the city. I will wear my boots, one pair of jeans, sweatshirt and winter coat onto the plane with me, and the rest of the wardrobe (minus undergarments) looks a little something like this:
This picture is of 3 sweaters, 2 long sleeve undershirts and 2 camisoles, and a t-shirt and sweats for pjs. That, my friends, is it on top of 5 socks, and corresponding undergarments. I figure, if my jeans or tops get wet or dirty that my Aunt and Uncle in-law won't mind us commandeering their washer and dryer.
For carry-on toiletries we are each only allowed a one-quart zip-lock, which means sharing (or more like my husband agreeing to use MY toiletries):
Not a completed set, but you get the idea.
I'll stuff a day purse into my back pack to use during our excursions in London, and we will borrow umbrellas from our family or just buy some cheap ones when we are there. I will also pack our Kindles for reading on the flights.
I put my clothes in ziplock bags to keep everything clean, dry and organized.
And my carry on is now light and ready to go on the plane with me for a 5 day trip to London!