Scientists have long pondered over this question and…I believe I have found a solution.
It’s actually much simpler than expected: a microskirt is acceptable when combined with short shorts.
This allows the microskirt to appear like a skirt, but it doesn’t actually expose anything.
Thus: modesty is preserved and all is well.
This may also possibly make short shorts slightly more acceptable too? After all, they’ll look more skirt-like.
Really, a microskirt is more like an accessory for layering than a piece of clothing.