This is totally in the realm of headcanon, but maybe Molly (or Arthur, etc.) simply isn't trained for that type of magic?
I mean, think about it. You have Wizarding tailors and so on, and people can be better or worse at Charms, Transfiguration, Defense, etc. It's fairly safe to assume that there are some areas of magic that different people are good or bad at, like some people are good at math or writing or whatever.
And a piece of clothing is pretty complex if you're making it from scratch, more so if you want it to look better than a hand-me-down (which is presumably the goal here). Well, she could just buy new clothing and duplicate it, yes, but maybe tailors/stores put anti-duplication charms on their clothing so that they'll still have business? The charm could be broken but I doubt the mother of seven or something kids has the time, energy, or patience to devote to doing so.
no subject
I mean, think about it. You have Wizarding tailors and so on, and people can be better or worse at Charms, Transfiguration, Defense, etc. It's fairly safe to assume that there are some areas of magic that different people are good or bad at, like some people are good at math or writing or whatever.
And a piece of clothing is pretty complex if you're making it from scratch, more so if you want it to look better than a hand-me-down (which is presumably the goal here). Well, she could just buy new clothing and duplicate it, yes, but maybe tailors/stores put anti-duplication charms on their clothing so that they'll still have business? The charm could be broken but I doubt the mother of seven or something kids has the time, energy, or patience to devote to doing so.