The ornamental design for a neck and chest warmer, as shown and described.
FIG. 1 is a perspective view of the inventive design in an "as worn" environment as seen from front and to one side in a "zipped" condition;
FIG. 2 is a front perspective view of the inventive design in an "as worn" environment in a "unzipped" condition;
FIG. 3 is a perspective view of the inventive design in an "as worn" environment as seen from one side in a "zipped" condition, the view from the opposite side being a mirror image thereof; and,
FIG. 4 is a perspective view corresponding to that of FIG. 3, but with a head covering buttoned thereto.
The broken line showing of the human form in FIGS. 1 through 4 is for illustrative purposes only and forms no part of the claimed design.