A plain white scarf in my opinion is so important to have. You can wear it with literally any color, during any season, and for most occasions. This is one piece you aren't going to get tired of because it can alter any outfit. It goes with practically everything.
Similar - Target - $14.99
2. Neutral flats
These are always good with basically every outfit you own. You can wear them with jeans, dresses, skirts of every color. You can wear them with color nylons, black tights, bare legged, etc. Get the picture? A little added bonus: they're usually pretty dang comfortable.
Similar - Target - $39.99
3. A watch
Whatever color floats your boat, watches will always be a thing. I personally think a non-showy gold or rose gold watch is the perfect staple because I get sick of the colorful ones after awhile. Gold is classic and matches with pretty much everything, as well.
Exact- Target - $16.99
4. Pearl stud earrings
A CHEAP pair of pearl stud earrings to be exact. We all know that horrible feeling of loosing a special/expensive piece of jewelry. There's nothing worse than reaching up to your ear and noticing an earring is missing. Pearl studs are elegant and will never go out of style. EVER.
Exact - Forever 21 - $5.80
5. A pearl necklace
Whether it's a bigger pearl necklace like the one I have or just a single strand, it's important to have. It dresses up any outfit and they are just simply so beautiful. Be an Audrey, not a Paris ;)
Exact- J.Crew - $98