Burda Summer Linen Dress “sew easy” sew what went wrong? or in the words of my children….”epic fail!”

HELP NEEDED PLEASE!!!!

Friday started well. My day off, and I had promised myself to allow myself 2 hours to cut out and make a start on the linen dress that I have been harbouring a pattern for…for ages!!

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I had chosen some lovely grey linen and some rather random buttons of which I only needed one but have yet to decide on which one….

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I spent time, a lot of time, carefully pressing the linen (which quickly proves to be a waste of time!) but that’s linen for you…..laying out fabric, pattern pieces and finally cutting….

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This is where it all goes wrong!!!!!
I have to wait until today to start to sew….I’ve transferred pattern markers with thread, removed my first pattern piece from the back of the dress and then horror strikes!!!!! Oh my ****! expletive, expletive! I cannot believe what I am looking at…..

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I have cut the wrong pattern piece on the fold!!!!!!
So, now, I am stumped….I have managed not to cry but I am stuck and so angry with myself. How, just how did I do this?? I’m no great seamstress, but I’ve never done this before.
This is where I could really do with some help please!!
The front of the dress should have been cut on the fold and the back in two pieces….I have done the reverse!!! The back of the dress as you can just make out in the pattern black and white picture has a seam straight up the middle just to where it meets a small opening to allow for buttoning it up to slip over your head. I can cut the back piece in two I’m sure with no problem, but the front? This should be cut on the fold so one front piece and is gathered at the neckline in the middle to form some pretty folds (?) If I seam up the middle to rejoin the fabric, will this not totally throw out the gathers/folds and look incredibly strange with a seam up the middle?!! I can’t think of any other way because I’m such a basic sewer…..if anyone has any ideas or advice I would be so grateful!!!! It’ll either be ok or just look plain odd, there’s not much to lose I guess as I’ve already spoilt it. I’m so gutted….and I was hoping to wear this to a job interview on Friday!!! I am going to return to my crochet project….at least I can unpick any mistakes!
Just total pants. K x