You should be a girl. Try wearing long jumpsuits with black pantyhose and dark boots in winter. A smock is a sweatshirt with a hat and a pullover, but it's the kind that doesn't need to wear pants. There are many online. It's Korean. You don't need a figure. It's cute and handsome to wear.
In summer, to be honest, there is really no way. Come on, lose weight.
However, I suggest that you try not to wear too many layers when wearing clothes, that is, coats and shorts, which are easy to divide your body into sections and look chubby. Try to wear them as a whole to cover up their shortcomings.