I sewed up my muslin for the UP dress. It looks a bit strange as it is made from two different fabrics. Sorry for the poor photo quality - it is overcast and gloomy here today. The above picture shows the side that will have buttons.
I followed the first steps of attaching the front and back panels, then I did the centre back pleat.
Then I skipped lots of steps and went straight to shoulder and side seams so I can get an idea of the overall shape and fit.
In the pattern layout instructions it says cut 2 back pleats but on the actual pattern piece it says cut 1. So I cut one and used one in my muslin. I cannot see where a second pleat piece would go.
I have found out some things:

I am unsure how to sew the pleat securely without it looking a mess.

- I made the muslin too big...the measurements with the pattern are for the finished dress not the size it will fit. I made it XL size as I would prefer to make it too big and then scale down. I also think I am bigger than I really am. I am now thinking a lot about size and ease. I gave my muslin something like 9" of ease! I am getting a headache with this sizing. I found this chart from Butterick which looks useful. Anymore tips on how much ease to put into a dress? The measurements table that came with the Uniform Dress pattern are for the finished dress, not for the size it should fit.
- I had to retrace all the pieces... This was not too bad and is all done now
- I crawled under my bed and found I have used all my stash of lining fabric up, so will have to go and buy some lining fabric.
I am going to cut out the fabric soon but with school and pre-school on holiday next week I may have to slow down on this.

My sewing box