So, what's considered altering the garment? Wrinkles and folds in dresses, pants, jackets, etc. are pretty much always airbrushed out or softened at least in advertising imagery to appear less obtrusive and sloppy. Garments have been presented in photographs that way for decades. Believe me, if you saw an unretouched image next to a retouched one, you'd select the retouched one as what you'd want to see in advertising.
But this has always been my question"would it be the same for Playboy? The last time I saw one (it's been quite awhile now), those girls were so overly airbrushed, they look plastic, like Barbie dolls. Would a male reader of Playboy select an airbrushed centerfold image or would he prefer the natural image, with every scar, pockmark and skin imperfection visible? Hmmmmm...?