hi, I have completed three sweaters now and one tank top and all but one are way too big for me. Can anyone help me figure out what I am doing wrong? I have checked my gauge under the supervision of my favorite knitting shop (the girls there are very helpful). I have followed all their instructions. I took one completed item in and they said well you'll just have to take it out and decrease here and there to make it smaller. But I am not a designer and am not good at figuring out how to tweak my patterns. why doesn't my sweater end up with the proper measurements and be about 3 sizes bigger than the pattern says when I have the correct gauge? I'm so frustrated.