Kate Middleton wore a green polka dot midi dress by Suzannah on a royal tour of Ireland in March 2020. If you loved her look, M&S has dropped a £39 dupe in their autumn/winter collection. Kate Middleton wore a green polka dot midi dress by Suzannah on a royal tour of Ireland in March 2020. If you loved her look, M&S has dropped a £39 dupe in their autumn/winter collection.