You don't give any numbers as to 'big' but perhaps some ideas here:
Vermont Fiber says they are 'Your Hand Knitting Pattern Source Sizes XX-Small to Plus Size 6X-Large.'
Norling has a cardi that goes to 68" and I'm working on one of her vest patterns that has chest of 60".
ETA: If you find a larger pattern you like and want to alter it to your size, you can DL this small, easy program:
Input your measurements (of garment sz you desire) and it'll calc the new working numbers (stitches, incs, decs) for you.
You can also find lots of helpful info here: