What to wear when the King and Queen of Englandcome for a visit?
Robbins worked very closely with John Bright from London-based Cosprop, which specializes in historical finery.
She accessorized it with a tiara made with Swarovski crystals.

Jason Bell/Focus Features
The whole thing came together beautifully, says Robbins.
Cora wears this shape really, really well.
In other words: yass, queen.

Courtesy of Anna Robbins
Downton Abbeyopens in theaters on Sept. 20.