Alfred Sung dress. It is very feminine. Margaery stick to simple shapes.
Mac Duggal dress is very bold for Margaery but I like the idea of putting her in a rose dress since her house sigil is a rose.
ML Monique L'huiller dress is a different shape than she normally goes for. It's very traditionally princess but, it has the softness she normally embraces.
This dress has a low neckline and exposed back that she likes.
embroidered Theia dress is the perfect blend of both of their houses.
See where I link up
Look at Cersei and Sansa