Stupid Mistakes are Stupid

I just wasted a few hours cutting and sewing a shift that turned out too small for me.  I made a really dumb math error, which led to the shoulders being too narrow.  I caught that in time and pieced in some fabric to fix it, but I didn't account for the fact that the same error would also make it too small in the boobs.  I'm not talking 'Oh, that's a bit too snug.'  This is 'seams straining, smash your boobs flat and still can't pull the shift all the way down' too small. 

Now I have to decide if it's worth it to pick apart my flat-felled seams and piece in some more fabric or if it would be better for my sanity to call it a wash and start over.  All that it lacks at this point is a hem and neckline casing...but picking apart felling?  Yikes.  Not the ideal way to spend the afternoon.  Maybe I'll work on my petticoat for a while and avoid the issue.  LOL

ETA: Thanks for the support ladies!  Just knowing I'm not the only one who's goofed up a 'simple' project like this makes me feel so much better.  I decided to redo the body (this was after I made a mistake cutting off the the problem areas...maybe today just wasn't my day for sewing!)  I was able to salvage the sleeves though, so that saved time.  Now I just need to wiggle into my stays so I can mark the 'real' neckline.  I see the light at the end of the tunnel!