Dress: Stanwyck Dress by A.L.C. (Thanks olihju!)
Gemma (played by Zoe Boyle) on Four Weddings and a Funeral on Hulu was spotted wearing this purple peplum dress on Four Weddings and a Funeral on episode 'We Broke' (1x03) in Aug 2019. Gemma's Dress is the Stanwyck Dress by A.L.C. .