I have never been a impulsive shopper, but I wasn't the wisest shopper either. I bought items that I loved, without ever thinking about what I had home already. It is nice to love everything in your closet, not so nice if you want to wear a dress and realise, none of the shoes in your closet are right for it. Aside from jeans and black boots I would never think to buy enough classics.
So now I have strategy.
I call this winning system (you can see that I love poker) The lady and the tramp. It is quite simple, for classics I go for quality, and for fun I go for inexpensive.  This works for me.
So cashmere you spend, or wait for a good sale, for a loud print, you don't.
For black, camel, brown, cream, you spend, for electric blue, a lot less.
At sale time it works even better. Last week I bought a nice cream cashmere  sweater, knowing that it will never go out of style.

LADY:
1. Woman by common objects zipper boot
2. Equipment Sophie blouse
3. Dear Cashmere sweater
4. Ohne titel pleated dress

TRAMP:
5.QSW flag sweater
6. Aldo Mandina boot
7. H&M skirt
8. Mango silk cotton blend shirt
9.Topshop sequined peplum top