Workout fiend;Plumper;Shrinking violet - Tradução em português

Por favor, traduzir as partes destacadas. Obrigado.

So the man dresses badly. That's the least of his flaws, right? Sure but it's still an interesting stylistic tic of Ryan's because it's not that he dresses badly – it's that he buys clothes that are too big for him. Ryan is known to be quite a workout fiend and, judging from the sound of his exercise regime, must have the body of an Olympian. He's clearly no shrinking violet in terms of putting himself forward. Why – or what – is he hiding?
There are only three possibilities:
1. He used to be a bit plumper and hasn't had time to buy new clothes;