Any Forever Yours Bridal...

BMs? My girls ordered their dresses online from a reliable vendor. Thing is, girls measured themselves using the chart at the Forever Yours Bridal. My sister went to Macy's, The Bridal Shop and Estelles and tried on size 12 dresses from Forever Yours and they fit, so she ordered a size 12. Turns out, her dress doesn't fit her! She now began this diet....and hopefully it helps, but what can we do w/ 2 months left for the wedding?! Did any other FYB bm or bride go through this problem? Is it the fabric dye or is it just my sis got fat? LOL