1.1 is a right side view of a sliding collar for a parasol showing a first embodiment of my new design;
1.2 is a front view thereof;
1.3 is a left side view thereof;
1.4 is a rear view thereof;
1.5 is a perspective top, right side view thereof;
2.1 is a right side view of a sliding collar for a parasol showing a second embodiment of my new design;
2.2 is a front view thereof;
2.3 is a left side view thereof;
2.4 is a rear view thereof;
2.5 is a perspective top, right side view thereof;
3.1 is a right side view of a sliding collar for a parasol showing a third embodiment of my new design;
3.2 is a front view thereof;
3.3 is a left side view thereof;
3.4 is a rear view thereof; and
3.5 is a perspective top, right side view thereof.
The broken line showing of a pole and ribs is for the purpose of illustrating environmental structure and forms no part of the claimed design.