The ornamental design for a shirt, as shown and described.
1. Shirt
1.1 : Front view of a shirt;
1.2 : Back view thereof;
1.3 : Top view thereof;
1.4 : Bottom view thereof;
1.5 : Right view thereof;
1.6 : Left view thereof;
1.7 : Reference front view in a worn state thereof;
1.8 : Reference back view in a worn state thereof;
1.9 : Reference view thereof;
1.10 : Reference view thereof;
The portions represented by solid lines in the drawings are the sections for which registration as a design is sought; the diagonal lines shown in the reproductions Nos. 1.9 -and 1.10 form no part of the claimed design. The tension of the shirt and pants is different depending on the region; for a wearer who is for example playing sports, doing heavy lifting, or is under nursing care, the shirt provides muscle and joint support; in reproductions Nos. 1.9 and 1.10, the patches marked with hatching lines are shirt sections where the tension is strong; furthermore, in reproductions Nos. 1.9 and 1.10, the hatching-marked patches are generally situated where the supraspinatus muscle, the teres major muscle, and the psoas major muscle are located. These areas with strong tensions provide muscle support, as if tape (or cloth) has been applied to that area. The broken lines in the drawings illustrate portions of the shirt and form no part of the claimed design.