1. Sewing: If you have sewing skills, you can try to cut and sew the extra-large winter vest by yourself, and increase or decrease the cloth in the appropriate position to adapt to your body shape. Pay attention to the selection of suitable sewing thread and needle to ensure the durability of the reformed vest.

2. Cutting: If you are not good at sewing, you can take the oversized winter coat vest to a professional tailor's shop or clothing modification shop for professionals to cut. They can make appropriate tailoring according to your figure, so that the vest fits your figure better.

3. Add accessories: You can also add some accessories to the oversized winter vest, such as zippers, buttons or straps, to better adjust the tightness of the clothes. These accessories can make the vest easier to put on and take off, and also provide more styles to choose from.

No matter which method is adopted, it is necessary to ensure that the reformed vest can still keep warm effectively and maintain the original cold-proof function. In addition, if you are not sure how to carry out the transformation, it is recommended to consult professionals or refer to relevant tailoring and sewing courses to ensure the safety and effectiveness of the transformation process.