A midi dress with three-quarter sleeves solves the coverage problem elegantly. You get coverage without needing to add another layer and without the formality of a long sleeve. Three-quarter sleeves sit between your elbow and wrist which creates a proportion that works well with the midi length. This sleeve length is practical for spring and fall christenings when bare arms feel wrong but a jacket feels like overkill. The detail also adds visual interest to what might otherwise be a very simple silhouette. Look for dresses where the sleeve opening is tailored and sits cleanly at the forearm. A midi dress with three-quarter sleeves is the kind of piece that makes getting dressed for a specific occasion actually straightforward.