Cinch in to create a waist. Pick dresses that gather at the waist or add a belt.
Go for detail that diverts eyes away from your waist
Shorter length jackets will add visual shape definition
Dare to bare - slim pins are one of your assets - show them off.
Topwise - avoid tummy clinging T's or knitwear. Go for soft fluid fabrics.
Generally think about colour and detail to break up your silhouette.