Boxing Sweat Suit Will This Help Me Get In Shape?

Will this help me get in shape? - boxing sweat suit

I bought a sweater yesterday, because my boxing coach told me I should gain weight and lose muscle definition, so I was wondering if there is a good idea, a sweatshirt in practice and help me lose weight and gain muscle definition is the training of boxing and weight lifting, running, while other exercises while wearing overalls. Who knows if Mike Tyson or Muhammad Ali wore tracksuits during training or a boxer, another was the development of professional boxers and many miles per day and manage several times a week Runn? I hope you answer my questions thank you.