For those trying to understand the issue with pony shaitels, I once heard the explanation that since pony tails are worn by a very large percentage of frum teenage girls, it signifies a “besula” and a married woman, an “aishes ish” is not supposed to look like she are unmarried, which she may be confused for if she has the same hairstyle.
That’s why many poskim in Eretz Yisrael have an issue with married women wearing pony shaitels.