It isn't possible to focus weight gain unfortunately; everyone gains weight differently and puts it on in different places. She could try gaining and see where her weight goes and decide what to do from there.

Rum and coke, or melon liqueur.

No idea as yet, it hasn't been officially revealed at all, no official art or anything. They might possibly hold it back until Pokemon Z comes out in order to stretch 6th Gen out a bit, since it's the only unrevealed Pokemon left.

Getting away from him is for the best - he sounds like a control freak and him threatening suicide over it is more emotional blackmail. Him locking you out of the house when he didn't get his way is also bloody disgraceful.

As the others have said, it's best to take care of yourself and get away from him as much as possible.

I usually just wear pyjamas except in hot weather, then I opt for a tanktop/singlet and boxer shorts.