Clothes that fit and suit your shape. I do think that you can shop cheap and still look quite chic if you accessorise well. No point in wearing Next, Principles etc. if there's no oomph from funky jewellry, eye catching belt etc.
Sexy shoes, the best you can afford, I always notice shoes before anything else.
Clean and neat does it for me, short clean nails, same for hair unless you're blessed with supershiny long well kept hair .
If wearing shoes that show off your feet then always have a pedicure, get rid of rough skin and tend to the toes.
I always feel great with clean skin and won't leave the house without a touch of strobe cream. Makes me look the age I should look, if the kids hadn't stripped the youth from my face on a daily basis.
Failing any of the above I at least need plenty water, sex, exercise and sleep. Only just managing the exercise now and feel great. Still got to get more sleep though.
I always wear matching underwear, non-negotiable, but then I'm a bit Bree.
Finally, a big lingering kiss from Dh every morning before he goes to work sets me up for the day!