The Bystander did a good job of paying attention to developments in Ireland. Lady Edina's article in thepeerage is here. Getty has photograph of her bridal party here.
Columnar dresses are coming, but not yet arrived in 1908 when Lafayette took this photo of Lady Edina. Her dress has two bertha - one of lace doubling as epaulettes and the other of plain material above it knotted below her neckline.