I went straight to the men's section and started my search for the biggest, longest sweater there. I found two actually. This is just the first of the two. I'll do a proper tutorial for the second one. Here's the before:
If you have some basic sewing experience you can probably figure out what I did but I'll post an in depth tutorial in the next week or so. Basically just look for a high quality material/designer when searching for your sweater and then see how long it is. You could make some pretty cute tunics with this same method. I'll leave you with one more photo of me looking like a real goof. Bathroom photo shoots are the best.