For those basics, accessorise as you wish. Keep your wardrobe minimal and regularly clear out what you no longer wear. It’s better to invest in a nice handbag and shoes. Oh, and smile. You can carry off anything with a good smile.
Never neglect yourself, Don’t get stuck in a style you wore in your 30s, else it will age you instantly. For those over 50, steer well clear of fur, unless you want that “wrinkled trophy wife” look.
Then stock your closet with a blazer (“belt it!”), trench coat (Burberry if possible, but not necessarily), navy sweater (“more sophisticated than a plain black sweater”) and tank top (“a classy supporting act”).
Not to forget a little black dress (not simply an item of clothing, it’s a concept), the “perfect” jeans (“like salt, they go with everything”) and finally a leather jacket (guaranteed to save any overtly-conventional look).
Mix styles and never co-ordinate. Reject bling. Explore new labels. If it feels right, wear it. Worship no fashion idols. You don’t need too much to look good. For clothes you can manage with cheaper things.
Try venturing into the menswear department -- it's usually very good, or sometimes too much for men but perfect for us -- or better still try dabbling in the children's section.
There are a lot of women who think it’s not possible to go out without high heels. It’s incredible... If they put on high heels just because they think they are too short, well, nobody cares that much. Just wear your style.