The ornamental design for a pair of pants having an inside design, as shown and described.
FIG. 1 shows a front view of a pair of pants having an inside design.
FIG. 2 shows a back view thereof.
FIG. 3 shows a front view thereof, where the pants are inside out.
FIG. 4 shows a back view thereof, where the pants are inside out; and,
FIG. 5 shows a perspective view thereof.
The broken lines shown in the views are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design. The pair of pants is shown with a symbolic break in its length. The appearance of any portion of the article beyond what is shown forms no part of the claimed design.