While from the front, the high neckline and wide-leg trouser sillhouette may have looked relatively demure - but once she spun around, the trick-of-the-eye design gave the impression that she'd forgone a top entirely, with nothing but a scarf falling down her back.
37-year-old showed off the revealing backless number to full effect, by scraping her hair back into a high swinging ponytail, and working some well rehearsed poses for the cameras.
What do you think of Heidi's flesh-flashing all-in-one? Let us know below!
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