if you are using anything from Windows 7 upwards, the Photo Viewer that comes with Windows will do it for you. Just use the little round arrows in the bottom toolbar. When you close the viewer, it will ask you if you want to save your changes. Click yes, done.
(In fact, if remember rightly, it may even rotate pictures correctly automatically when you open them, but I can't verify atm as I'm on an iPad right now.)
Just have the trousers of your suit shortened, the...