Is 360cc silicone too big for my frame? I'm 5'3 & 135lbs.

It's a great question, but unfortunately it can't be answered without an in person examination. Sizing a breast implant is based on a goal look and the person's breast dimensions. The breast width, nipple to fold distance, and soft tissue characteristics are all to into account when sizing an implant. Ultimately, this comes down to a decision that you will make together with your plastic surgeon.If you have any concerns that your implant size may not be right for you, it would be a good idea to have another visit with your surgeon. This will allow you to move forward with confidence. 

Hello,No one can answer that question. If you're talking about proportions, that's an opinion, and ours may not be in line with yours. If you're talking medically, then height and weight are not used to determine implant sizing. Five quick measurements of your chest and breast tissue will allow a knowledgeable surgeon to objectively determine your soft tissue capacity and the right sized implant for you. Best of luck!