Does that mean you are going to take a day off? Or are you going shopping after work?
Don't forget to buy some nice warm socks that don't have holes in them.
Did you investigate buying online from the UK as was suggested?
The jumper and jacket looked good. Waterproof and warm.
There are many times when Isaan isn't so wonderful but it is never too bloody cold, for me anyway, maybe for Thai's it is.