I must be doing something wrong...

    While I was struggling to have skirt 116 from Burda Magazine 9/2010 fit, I met this problem. I think it has to do something with geometry, but I can't find out what! Do you have any clue?
    Here's the paper pattern. Very carefully traced and cut and as I checked twice each curved piece matches the  other pattern piece perfectly.

But when the pieces were sewn together I ended up with this

As you can see, only one seam was a perfect match (don't pay any attention to the pointy pieces, if this wasn't a muslin they would be cut off). Here's a close look.

Why does' this happen? Every single piece and every single side of every single piece has the same seam allowance and has been checked twice. If I go pinning the back skirt panel it looks like this

So my seam line leaves out some pattern parts. 

Here's a close with a drawn seam line.

There has to be some kind of an answer. Do you know it by the way?

See you around

Maria