^ Such a good point to stay in touch with what's already IN your wardrobe!
I gravitate towards the same types of items and will wind up with the same things over and over if I'm not careful
Looking for great quality and caring for them properly will insure they last a long time.
I HATE replacing classic items, so I invest up front to save time & hassle later.
Regardless of how much money you have to spend, get the best quality YOU can afford and it will pay off!
I would think the keys to minimalism are buying separates & knowing your body type.
The types of items you get would be driven by your frame and personal preference, whether it be skirts/pants, dressy/casual, etc.
Think about the types of things you do daily and events you may have coming up for the year and fill in the gaps keeping in mind what you already own.
Even though, it's minimalist, it's still personal so it's hard to guage what EVERY minimalist wardrobe must have.
One minimalist may hate skirts while the other hates pants.
As far as colors, sticking to neutrals is wise.
Then you can pop in color as desired from season to season.
I also consider red to be neutral. It goes with EVERYthing!
I'd highly recommend a classic red handbag as a go-to handbag. Mine's fabulous
Latte/nude/cognac shades also go with everything