If you read my reviews on PatternReview you already know that I just found this out!
Now I've sewn from Burda patterns and those do include seam allowances. I guess I made an assumption (tsk, tsk) that seam allowances were included on the patterns in the magazine also.
That explains why the past two skirts I sewed from BWOF were tight. Tight enough that I verified I had traced and cut out the correct size. Come to find out that I had never added seam or hem allowances (she said as she blushed bright red).
Just goes to show that it really doesn't matter how long you've been sewing. There's always more to learn.
By the way, here's a neat little tip that Kristine left for me in the comments section of the BWOF skirt I reviewed on PR:
Pin It...the easiest way to trace and add seam allowances at the same time is to take 2 pencils, putting a small piece(s) of cardboard between them to space them your seam allowance amount, then tape the pencils together. One will trace the seam line, while the other will automatically place the cutting line.