I claim the ornamental design for a portion of a garment, as shown and described.
The FIGURE is a Front elevation view of a portion of a garment showing my new design;
The jagged broken line showing in the FIGURE is a boundary of the claimed design, the claimed design extending to the boundary but the boundary not being part of the claimed design.
The remaining broken line showing in the FIGURE is for illustrative purposes only and forms no part of the claimed design.
The opposite side of the garment, not shown in the FIGURE, forms no part of the claimed design.