I think I mention this every time the sales roll by, so sorry for repeating myself, but it really is an excellent habit: stocking up on any item that is not so fun to buy, during the sales.
Since I recently discovered that French La Redoute ships to me (oh the joy!), I decided to take advantage of their sale in order to stock up some useful, yet unexciting basics:
A black blazer
black cashmere cardigan with mother of pearl buttons.