A summer dress in midi length extends coverage while staying cool through lightweight fabric. Midi length combined with summer fabrics creates formality without bulk or overheating. The length works particularly well for spring christenings and it photographs beautifully. Look for midi summer dresses where the hem hits at the calf and the silhouette is clean rather than fussy. The fabric needs to be light enough to move properly at midi length. A structured bodice at midi length reads more formal than a flowing silhouette. Midi length also means you can wear sandals or flat shoes rather than heels if you choose. A midi summer dress is the intersection of appropriate length and comfortable fabrication.