I do it all the time, and I've had no complaints. Quite the opposite. I know lots of women who do.
I have no idea why she thinks sandals are the only thing appropriate to wear with a skirt, unless she's got issues with something you're intending to wear that she thinks its "inappropriate" and can't come up with another argument. But there will be situations, such as work, where sandals may not be appropriate but dress boots would be which would negate her argument.
I have no idea why she thinks sandals are the only thing appropriate to wear with a skirt, unless she's got issues with something you're intending to wear that she thinks its "inappropriate" and can't come up with another argument. But there will be situations, such as work, where sandals may not be appropriate but dress boots would be which would negate her argument.