Hi, about the shirt-sucking thing... it's called wool sucking and is usually not a problem. A cat will suck and chew many materials (not just wool) and may also seem relaxed and contented, a bit like when a baby sucks its thumb. It's probably and inherited trait, especially if your cat is a siamese. However, make sure that your cat doesn't swallow too much material because it may need to be surgically removed.
Also, the peeing thing, cats just tend to do that as they get older. I had a cat called Brando who used to do it a lot, there's not an awful lot that can be done about it.
Hope i've been of help!