Since first seeing them, I loved the gowns that Cersei's handmaidens, women in King's Landing, and later Shae wore. Looking at them, I realized that they were really quite simple--a giant tube with drawstrings at center front and back and belted at the waist. Mine is made from about five yards of silk taffeta from Renaissance Fabrics which I washed to change the drape of. My belt is made of Worbla based on this tutorial by Jak Cosplay. I learned the hard way that you should read the description carefully on your chainmail rings and make sure they're not for jewelry.
After figuring out my dress, I did a search to see how others had done them. I found a sketch that someone who had come to the same conclusion had done, but haven't been able to find it again. I also found a post on the Game of Thrones Costuming Facebook group with a similar technique.
More pictures of the dress can be found here
Being me, I hand embroidered the front panel, used fingerloop braiding for the ties (using the videos seen here. I used 5 loop flat for the drawstring and 5 loop square for the tie. I finished the ends with gold rings from Fire Mountain Gems by sewing them to the ends and wrapping the join with thread), and hand sewed the seams. However, this can be a very quick project! You can see some progress pictures using the hashtag got_handmaiden_k on Instagram.
But onto the dress! First, a video of putting it on. I also have pictures at the bottom of the post, but the video shows it more clearly. And obviously I don't wear a camisole or underskirt when I'm wearing it, but it was necessary to do something for pictures!
Here's the pattern for the dress. It really is just a giant tube--this pattern shows half of it. It's of course sized for me, but since it's fitted with drawstrings, very adjustable. I used three panels of 55 inch silk and a contrast panel in front. The width of the contrast panel was decided by the width of the design. You could also use your fabric sideways and have fewer seams, but I was using shot silk and liked the color better used the usual way.
My dress has a circumference of 4.78 yards, or 4.38 meters. It could be a little less full, but not by much. I tried it with two panels of fabric but it wasn't nearly enough and I had to order more.
To determine the size of the drawstring channel at the center front, I held the dress up to me and bunched it until I liked it. The channel is 36 inches or 90 cm long.
To sew it, I first sewed the channel (a strip of silk on the straight of grain) right side to right side. Then I hemmed the top of the dress on either side. Then I folded the channel down and sewed it into place. I topstitched the top edge to help keep it flat.
To determine where the waist ties should go, I pulled the fabric to the center back and pinned the dress at my waist. I sewed China silk ribbons about an inch in from the edge. These ribbons keep everything where it belongs so the belt doesn't have to do as much work. Ribbons don't need to be as exact as something like hooks and eyes, which works well since the neck might be tied differently or the gathers might be in a slightly different place each time you wear the dress.
Because the neckline dips down and becomes the waist, hemming this dress was quite awkward! I used the same technique I described in this post only the hem was too steep to just fold it, so I had to cut as I went.
Then tie the ends of the neckband together. You could also use a longer neckband and tie it like you would a drawstring. I like the loops at the end because they make it easy to tie it the same length each time.