The ornamental design for a onesie with loop and links, as shown and described.
FIG. 1 is a front perspective view of the onesie with loop and links;
FIG. 2 is a front elevation view of the onesie with loop and links;
FIG. 3 is a rear elevation view of the onesie with loop and links;
FIG. 4 is a left side elevation view of the onesie with loop and links;
FIG. 5 is a right side elevation view of the onesie with loop and links;
FIG. 6 is a top plan view of the onesie with loop and links; and,
FIG. 7 is a bottom plan view of the onesie with loop and links.
The partial human figure shown in broken lines is environmental subject matter included to illustrate how the design may appear when worn and forms no part of the claimed design. Both the figure on the front of the onesie and the shape attached to the links are features of the article that form no part of the claimed design.