Normally, when I buy a skirt with an elastic waist, I have to go down one size. I bought a skirt online with an elastic waist and yet it was still too small. I have to buy my "normal" size. Does this vary depending on the brand? It can be difficult to order online some of the time. Even within the same brand, skirts my fit differently depending on the style and particular skirt. I am starting to think that I should just order both sizes and send the one that does not fit back. What do you think?