Dress for the job you want?

[Spudsulike]

I've been told I should seriously think in the next year of applying for quite a senior position, if it does become available. Atm, I wear smart dresses (Hobbs, whistles etc) but with cardigans and flats. Want to transition slowly into suits and more professional workwear as would be much more client facing and seems more appropriate. Looking for ideas of what would fit this role? Any coats/jackets/suits/shoes/blouses/bags/accessories/shop recommendations welcome! Should I start with a capsule wardrobe? Thanks.