A capsule isn't about owning less for the sake of it — it's about owning pieces that multiply. Start with a coat that covers your longest layer, then a knit, a shirt, one trouser and one boot.
The trick is a shared palette. When every piece sits in the same three tones, any two of them work together without thinking. That's where the fifteen outfits come from.
Buy the coat first and best. It's the piece people see, the piece you wear daily, and the one worth the largest share of the budget.