I am working on a dartless blouse pattern Burda 3212. It is an OOP pattern. The fit was pretty good, but got better when I pinned in a bust dart. I don't need the width of an FBA, just a bust dart. How do I add a dart to this pattern. This was something I found on PR, but didn't understand fully what to do. http://sewing.patternreview.com/cgi-bin/sewingclasses/board.pl?t=1865
You say you pinned in the dart...was that from a muslin, a finished garment or were you tissue-fitting? (if the general guidelines below aren't helpful enough, that will be useful information!
) So it sounds as if you want the dart for shaping, but aren't needing to add additional fabric. If that's so, here's what I'd do.
Identify where on your pattern your dart's point is, as well as where it crosses the seamline. You can do that using your pinned dart fabric/tissue. Draw that line on your pattern.
Then determine how wide the pinned dart (as pinned) is/was at the seamline. Mark a point on your pattern seamline that is that distance on each side of the dart line you've already drawn. Then draw a line from each of those points to the dart point.
Now all you need to do is true the seamline. Lay a square of tissue paper behind where your new dart is and tape it to your pattern piece and fold the new dart how it will lay when sewn. Then straighten out the seam line. When you unfold the dart, you'll see the usual shape on the seamline for a "dart to be sewn."