A conscious wardrobe is mostly about wearing what you own for longer.
Audit first
Lay out what you already wear. Gaps, not trends, should drive purchases.
Think in cost per wear
Divide price by expected wears. A cheaper item worn rarely can cost more per wear than a better one worn often.
Build around a capsule
A capsule wardrobe is a small set of pieces that work together in colour and line. The idea was described in American publications in the 1940s and popularised by Donna Karan in 1985.
Care and repair
Following care labels, mending small faults and using a tailor all extend a garment’s life at low cost.
Source: Wikipedia: Capsule wardrobe.