A structured jacket over the top of a flowing spring dress, mini, midi, or maxi-length, provides both warm and a great contrast. That cute vintage dress you bought for warm weather will be almost completely unrecognizable. Depending on your body type, you'll also create clean, flattering lines with the hemline of your jacket. Follow these simple rules: boy shapes should choose shorter jacket hems (as shown). Jackets should hit the hip on curvier women.