A cotton jersey, peacock feather, maxi-dress! With a racer-back!
The fabric is from GirlCharlee.com. This was my first experience with them. Their fabric is very affordable and the service is excellent. You can get up to four swatches free, just ask. The pattern is McCalls 6744. What's great about sewing for my sister is that I usually don't have to make any pattern adjustments. She is a perfectly proportioned for the most Big-4 patterns, and even the design height at 5'7". Despite out different heights and body shapes, we have about the same bust-waist-hip measurements, so I can make her dress right out of the envelope, try it on me and know what I'll need to adjust when I make a version for myself (navy with polka-dots maybe?).
This dress is very easy, and you can get a maxi-dress out of just 2 yards of 60-wide fabric. The whole dress took me 3 hours, including cutting out the 4 pieces. The neck and arm holes are finished with a simple narrow hem; a breeze on stable, cotton jersey. I didn't measure, press or pin before stitching, just eye-balled it as I sewed and it came out pretty good!
My serger needs a new cutting blade, otherwise I totally would have done the side seams on it. Instead I did two lines of narrow zig-zag stitching then clipped my seam allowance close.