dart 
Symbol indicating the position and width of the fold on the inside of the fabric that makes the garment snugger.
fold line
Marking indicating that the pattern must be placed on the folded edge of the fabric and in the grain direction.
hemline
Line indicating where to fold the fabric to create the bottom of a garment.
lengthwise grain
Line with arrows indicating how to position the pattern on the fabric so that it lies in the direction of the warp threads.
alteration line
Double line indicating where to adjust the length of the piece of fabric to suit the person who will wear the garment.
seam allowance
Distance between the seam line and the cutting line; it creates a fold on the back of the garment once the seam is stitched.
marking dot
Sewing mark indicating an area that requires special attention.
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