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Strapless styles can be pretty, but they may not provide the coverage, security or support you need. If you find a strapless dress you love, a simple alteration can turn a strapless into a halter-style dress. Halter dresses flatter your shoulders and eliminate worries that your dress will slip a little too low while you're dancing through the night.
Put on your strapless dress. Measure from the top edge of your dress, just in front of the underarm area, to the center back of your neck.
Experiment with fabric scraps or ribbon to determine your desired width. Try widths from 1-inch to 2 1/2-inches.
Add 27 inches to your desired length measurement. Multiply the finished width of your strap by two, adding 1 inch for seam allowances. This will provide the total dimensions for each halter strap. Cut two strap pieces to your desired dimensions from both fashion fabric and fusible interfacing. Fuse interfacing to the wrong side of each strap according to the manufacturer's directions.
Fold each strap lengthwise with the long edges together. Stitch 1/2-inch from the edge. Trim the seam allowance to 1/4-inch and turn the strap right-side-out. Press the seam.
Clip one end of each strap at a 45-degree angle. Fold the raw edges on each end of both straps in 1/4-inch to 3/8-inch, pressing as you go. You will have one even, straight edge and one angled end.
Pin the straps into place, adjusting their position if necessary. Hand sew or machine stitch each strap along the edge of your strapless dress with small, neat stitches.
If you need to shorten a strapless dress, the leftover hem fabric can be used for straps.
Opt for buttoned, rather than tied, straps if you have less fabric available.
Use coordinating fabrics for straps if you don't have additional fabric available.