The ornamental design for a strap with stitchpattern, as shown and described.
FIG. 1 is a perspective view of my strap with stitch pattern applied to a partial view of an article;
FIG. 2 is a top view thereof; and
FIG. 3 is another top view thereof showing more of the article; and,
FIG. 4 is another top view of my strap with stitch pattern on another article.
The long-short broken lines represent the bounds of the claim. The short-short broken lines represent portions of the strap with stitch pattern. The broken lines in the drawings form no part of the claimed design.