>>294447521
Shrinkwrapping produces generally undesirable results for characters, it's better to use sculpting tools and proportional editing, after scaling the bones of your outfit's original armature to best match the scale of your base.
2.8's Elastic Deform sculpting brush (using the "scale" and "tri-scale grab" options) specifically are incredibly useful for fitting things to your mesh.
But yeah, for this one, better to either retexture the body and have a masked matcap on the clothes part or cut along the body mesh and assign a new material.