Pup Crew "Mommy's Little Boo" Dog & Cat Bandana
This is really cute, but it is thin. The description does call this out as being "light weight" so if that's not what you're looking for I would not recommend it. I didn't see it anywhere obvious in the description, but this stays on with Velcro. It is not a tie style bandana. The medium/large is an exact fit on my Labrador. If it were any smaller it would not have worked. He's 1.5 years old and approximately 70lbs.
I wanted a different costume for my dog, but they were out and never got it back in. This is very cute though.