Dry Shampoo. You never know when an exciting invitation is going to land at your door step last minute and this is essential for quick spruce ups and giving hair an extra lease of life. If your hair is really fine or flat this can also offer added texture and volume, and is especially great for up do's when the hair requires more grip.
Spot Treatments - Even if you're blessed with perfect skin ( hate you! lol) you never know when one might pay you a visit. Spots treatments can calm down any redness and wave goodbye to the pesky blighters in no time at all, and need a to be in your stash because when a big event is on the horizon chances are you'll get a first from the spot fairy and this will be your saviour!
Mascara. I know its simple and most of us do own, but mascara makes a massive difference to your look and even if you're not a huge make up wearer this is a simple and effective way of making yourself look more put together and polished, even on no make up days!
Flannels. I know, I know its simple yet I don't know what I'd do without them! They clean your face and body and offer a gently exfoliation to the skin which will leave it looking brighter and more even.