I have a bit of a muffin top. It's the only part of my body I absolutely hate. . . I've made peace with the rest of me and actually enjoy my curves. I hate that extra roll around my middle, though, and try to find shirts that cover it up. Because of this I tend to buy shirts that are way too big.
I also shop online. That makes returning clothing a big hassle and I don't like to do it very often. I got some polo shirts on sale but they were a bit big and baggy. I didn't like the fit. I was also too lazy/cheap to pay the postage to return the shirts for an exchange.
I decided to take the shirts in at the side.
It's very easy. Put your shirt on inside out and pin it where you want it to be sewn. I draw a line to make sure it is even on both sides and to add a little bit of form to it.
Sew and flip right side out. Enjoy!
If I do it again:
I will take before and after pics! It's a HUGE difference! I would suggest sewing twice on knits that are super stretchy - once with a long stitch and once with a zig zag to the inside of the long stitch. I am sure there is a stitch especially for knits but we all know I don't know it. . . . and don't particularly care to know it!