>>2839648If it's an actual gap rather than edges and in the default state there is none, select the whole length of the border between meshes and merge nearest (~0.001) or, if UV map differences prevent merging (the texture would get distorted if the model had a complex skin texture to begin with) unify the weights of nearest vertices (either by averaging weights of selected or by weight painting manually, one by one in either case). You can select individual meshes with Ctrl+X after selecting a face, which should help you locate the border—assuming the legs aren't merged with the body anywhere.
If it's an edge, disable edge display or deal with it.
