I claim the ornamental design for a sun hat used with pigtails, as shown and described.
FIG. 1 is a rear perspective view of a sun hat used with pigtails illustrating my new design.
FIG. 2 is a front view of a sun hat used with pigtails illustrating my new design.
FIG. 3 is a first side view of a sun hat used with pigtails illustrating my new design.
FIG. 4 is a second side view of a sun hat used with pigtails illustrating my new design; and,
FIG. 5 is a bottom view of a Sun Hat used with Pigtails illustrating my new design.
The broken lines showing a pair of pigtails and a child's upper body and arm in FIG. 1 illustrate environmental matter and form no part of the claimed design. The broken lines shown along side the seams of the crown and in rows on the rim illustrate stitching and are part of the claimed design.