i've tried on several brands of shapewear and Flexees has some good products but this one tries to cover too many sizes and the garment is very difficult to fit in to and wear. I returned when i couldn't even get it on!  i bought a Carol Wior the same day and it fits quite well and is very comfortable to wear for many hours.
i would consider going up even one more size than your usual size in these type garments if you insist on buying this brand.