Sew Seam Allowance
You should now have two halves of the bow tie (one long and one short). Each half consists of two fabric pieces pinned together with the unprinted side facing out. Get ready to sew!
You’ll be sewing each half separately. (They’re only joined together by the hardware in a later step.) Starting at the end, align your fabric under the needle. Use the guides on your sewing machine so that the line of stitching will be 1/4 inch from the edge. Go as slowly as you need to… accuracy is important here.
You can see in the above photo that on my machine, a 1/4 inch seam allowance aligns with the edge of the presser foot. If your machine doesn’t have a guide to follow, you can put a piece of masking tape on the bed of the machine at the proper distance from the needle and follow that.
Use a small straight stitch and go all the way around the tie, until you reach the same end that you started on (but don’t close up the end). If the tie has corners, stop the machine and lift the presser foot to turn the fabric. If the tie has curves, just go slowly enough that you can keep the seam at 1/4 inch from the edge.
If you’ve sewn accurately 1/4 inch from the edge, the two rows of stitching on the long tail should be about 5/8 inch apart. If they’re more narrow than that, you’ll have a difficult time inverting the pieces. If they’re too wide, it won’t fit into the hardware.
In the next step, you’ll trim the seam allowance.