navy blue a line dress Zapaka Women Long Prom Off the Shoulder Formal Dress with Appliques, Navy / US16W Full Length Sleeve Style Fabulous Long Navy Blue A-line

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Directional pleating

Despite the open back and shoulders, and strategically positioned leg slit, the overall appearance is quite innocent looking

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There arent really any hard set rules

Definitely check the weather and what time of day the wedding begins (and ends) before making your dress selection