Yes indeed these pants are very comfortable. Infact they are so comfortable I fell asleep standing up while wearing these. So do not worry about that.

Yes, they are washable, spill anything on these and it will come right out.

Why don't you pinch the tip and find out. But to answer your question yes it does squeak, so squeak to your hearts content.

Yes, indeed they come in 4 various sizes: medium, large, extra large, and extra extra large. From Medium to big to even bigger it fits all except for small we do not have a small.