Tip of the day: There's a japanease character for the preteen called tenten. It's an older character and there are a lot of clothes for her. It takes very little tweaking to make those clothes fit posette. Like in this image, i first posed posette and then added the top and increased it to 120% and voila it fits. The skirt i just increased the length of and it fited.
Here's a link to a lot of free tenten clothes if you want to try for yourself: http://digitalbabes2.com/~yamato/MilGirl.html
Thanks you so much for the sweet comments.
I forgot to say that i first changed the scale of the body to 97%, then posed, then added ptclothing, then increased the body of the ptclothing to 120%.