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That dress is like a "questionable taste-level" trap that that those who want to stay in the competition should see coming, but someone puts their presser-foot in it every time.
When the end is reached, release the presser-foot, turn the work, and stitch back for an inch or more in the same line, as was done at the beginning of the hem.
For example, on sheets begin to stitch along the hem at the selvage, or if the end of the hem is over-sewed, begin an inch from the edge and stitch the hem towards the selvage, then lift the presser-foot so as to turn the work, and retrace the bit of stitching, continuing across the whole hem.