Because contrast makes an outfit interesting. When pairing a whimsical flowery skirt with a strict plaid blazer it creates an office wear of interest coming from the contrast between the irregular shape of the skirt and the strict blazer. All in grey notes and once again the belt. I believe the rather straight blazer was in a need of a touch of femininity from the waist belt when paired with this type of skirt.
Skirt – Vintage
Blazer – Tiger of Sweden
Boots – Rizzo