Yes, she looks miserable but really that's just her look. She is a cat of many faces. But, she is also known to lose her collar often. I was always reluctant to put a collar on a cat because I worried about the cat getting caught on something or choking. Now, they have safety collars that allow the cat to pull it's head out of the collar if it ever gets into a situation where it is caught. These collars do work and Sierra has proven that by working her way out of the collar just because she doesn't like them. Never use a collar on a cat that does not have the safety mechanism. Always test the safety link on the collar before leaving it on the cat.
Only about 2% of cats brought into shelters are re-united with their owners. It is much higher with dogs. One of the reasons is that the dogs arrive with collars and the cats do not.
Other than a microchip, a collar with ID and a phone # is the only way a cat can communicate if lost.
When fitting a collar, you should be able to put your index and middle finger under the collar when closed. If done properly, it will be comfortable for your cat. Remember, if fitting a collar to a cat that is not full-grown yet, you must check often to be sure the collar is not too tight as the cat grows and adjust it accordingly.
Sierra is the only cat in our household that wears a collar. She is our indoor/outdoor cat although she never leaves the property. She sits on our front porch most of the day.
I don't recommend collars on cats that are indoor only.