I made up a wearable muslin of Colette Patterns' Sencha blouse last month, out of some dark blue polyester crepe left over from one of my early sewing projects. Nowadays I wouldn't choose polyester, as it's rather annoying to sew with, but this leftover length was just sitting in my stash, so why not use it up? It gave me the chance to try out the fit and style. It feels a little loose; I've probably lost a bit more postpartum weight from the time I cut it out in November until now.
As I mentioned, polyester is not particularly fun to sew with, so next time I would choose rayon, silk, or a drape-y cotton. Another note for next time: I will hand-sew the hem, as the machine-sewn hem doesn't drape very well. Otherwise, I really like the style -- the keyhole neckline with ties is sweetly retro. Douglas gave me a new pleated skirt for Christmas, which goes perfectly with the top. Love it!