Zaftique is an online company that does quite a nice range of dresses (as well as skirts and tops etc) that would be good for harp gigs, recitals, and so on. They bill themselves as a plus-size specialist but their sizes start with their Size 00 for a 28″-29″ waist, up to a Size 6 for a 55″-60″ waist. Most of the garments are on the modest side, and quite a few have bell sleeves and renaissance or retro influence. The length is stated on all the items.
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Sydney’s Closet is a site selling formal/ball/prom/wedding party/etc dresses, they have from size 0 to 30+ in their ranges. Most styles run long because it’s expected they’ll be hemmed, but some even have an option when you order to add 5″ to the hem. There are a decent number that have sleeves (or a matching shrug or bolero or jacket) and are modest.