First, get some 'spanx' they are amazing for smoothing your midsection... then try empire waist lines on dresses, and also tops with a similar style (with a seam right under your breasts).
This look can hide quite a bit underneath, and it works because it is a popular look even for those with nothing to hide (my muffin top is totally gone but I still wear these flattering tops), also tops that 'wrap around' can work well for hiding belly lumps.
Also, try some higher waisted pants if you can do so comfortably, I was attached to my low-rise pants as a size 2 & 4, but a higher waist helped me look slimmer when I was a size 6 & 8.
Finally, choose quality fabrics, high quality cottons tend to hold a nicer shape when being worn than slinky, clingy, acrylics which can hug and highlight little bulges.
The spanx can be a little pricey, but you will still love them once you've lost the weight, they are great for smoothing underwear lines and make jeans wearable in the summertime (prevent chaffing)! they are well worth the 30-50 bucks!