Hi,
I went in February, so don't know what the weather will be like in November - check online. However, in terms of shorts and sleeveless tops - you cannot wear these in the temples - knees and shoulders have to be covered. Cut off trousers are fine. You will be completely barefoot in the temples (no socks) but outside of these temples I wore trekking sandels. There are some very early departures (6 a.m. was a lie-in!) and on Inle Lake in particular at that time it can be cold, so take a fleece/jacket etc. A hat is vital too, along with suncream etc. etc.
Anything else - please ask - and enjoy, it is a wonderful country.
Cheers,
Hils