I don’t recall ever buying things from Jewish stores. I find that they push stuff onto you that most of the time isn’t even Tznius, plus really expensive.
There is someone that comes, The Man With The Truck, he has a store in Brooklyn somewhere that has long skirts for really cheap.
My short skirts (that are below my knees) you can find in regular non-Jewish stores unless you are really tall.
And tops, just get a bigger size even though it might make you feel fatter ;).