black boho dress Amara Bohemian Maxi available in extended sizes. Veronica Beard Akara Silk Maxi

Picture by Vanessa Jackman And you

Take for example this A-line, short-sleeved shirt dress by COS

Flattering Midi Length with Side Slit for Ease of Movement

-----Size Note----- Size: Small US: 4 UK: 8 EU: 34 Bust: 74cm/29.13'' Waist: 66cm/25.98'' Length: 97cm/38.19'' Shoulder: 24.5cm/9.65'' Size: Medium US: 6 UK: 10 EU: 36 Bust: 78cm/30.71'' Waist: 72cm/28.35'' Length: 99cm/38.98'' Shoulder: 25.5cm/10.04'' Size: Large US: 8 UK: 12 EU: 38 Bust: 84cm/33.07'' Waist: 78cm/30.71'' Length: 101cm/39.76'' Shoulder: 27cm/10.63'' Size: X-Large US: 10 UK: 14 EU: 40 Bust: 90cm/35.43'' Waist: 84cm/33.07'' Length: 103cm/40.55'' Shoulder: 28.5cm/11.22''

While still formal, the guidelines tend to be a bit more lenient

elegant a-line long sleev plus size tulle bridal gown for women