Harder blankets and towel

Blanket is a very useful item, yet easy to make. 
Compare this: A pair of socks takes 2 rags to make, a blanket takes 20 rags. I'm pretty sure a blanket is much bigger than 20 socks combined, especially when you consider its warmth and coverage, there must be some stuffing inside for that. 
The same to the towel, a towel can't be the same size as 2 socks can it?

This PR is my attempt to re-balance blanket (normal and fur) and towel by making them cost more rags and time. The difficulty is the same though as this isn't about how hard it is but how much of a workload it is.