A basic top pattern can be altered to create a drape neckline.
To obtain the drape effect on the front neckline, I’ll draw some lines on the Lydia Top from BurdaStyle to make it similar to the pattern I used. I haven’t tested this, but I’m trying to give you an idea of how the pattern actually is.
Discard the neckline facings. These will be cut in one piece with the front and back.
Raise the inner corner of the shoulder seam in the back just a little, and also the center back line. Create a V shaped line at the outer corner of the shoulder seam, to create the back facing, that will fold in when sewn. Cut in a small pinch at the tip of the V line, to stitch the shoulder seam and the facing line when sewing the front piece to the back piece. The facing will be folded inwards, thus visible finishing seams will not show on the right side of the fabric.
For the front side, elongate sideways the pattern at the shoulders, draw the same V line and create the facing by raising the neckline.
I hope this is useful, and you get an idea of how the drape in the front can be created. The drawing is similar to the pattern I have used, and I think that Lydia can be adjusted this way.