What is the risk of complications from not using an internal bra after previous implants, lifts and weight loss?

I am wondering if you can give me an idea of what the chances of a complication from not using an internal bra if you have previously had an augmentation with a lift then later had implants removed and a minor lift done then as well. Additionally I am 58 years old and recently lost over 80 pounds. I know the chances of my skin being able to support new implants is not great but just how much of a risk am I taking?