The ornamental design for a glove-imitative soft costume, as shown and described.
FIG. 1 is a left view of a glove-imitative soft costume according to our new design;
FIG. 2 is a perspective view of the glove-imitative soft costume of FIG. 1;
FIG. 3 is a top view of the glove-imitative soft costume of FIG. 1;
FIG. 4 is a front view of the glove-imitative soft costume of FIG. 1;
FIG. 5 is a rear view of the glove-imitative soft costume of FIG. 1; and,
FIG. 6 is a right view of the glove of FIG. 1.
The bottom view forms no part of the claimed design. The features surrounded by broken lines are included for providing environment only and form no part of the claimed design.