Ok, so I figured I would update y'all as I go with this. We received our collars (came in a 3 pack from a seller on Amazon) on Friday, but after reading instructions and watching videos on correct fitting, we decided to wait until morning so we could monitor him throughout the day to ensure his safety before letting him sleep in it.
Saturday morning he started what has become his usual routine ( crowing roughly once an hour from 8:30 to whenever he feels like, usually between 2-5ish) he isn't at his oldest yet, at almost 27 weeks, but his frequency has been increasing lately. After placing the collar, LOOSELY, to allow him to adjust to the feeling, he elected to not even attempt crowing for the remainder of the day. ( Note: the collar was not remotely tightened, easily could get multiple fingers under, but not loose enough for him to reach it with his foot to pull off. As instructed, we placed it under his feathers making sure everything was smooth and comfortable for him)
Sunday: this morning, Mr E (named mystery as a straight run chick


) was comfortable enough to crow again. We went in and adjusted his collar to the appropriate size. This did take a couple of tries, as we did not want to just surprise him and tighten it all the way at once. Ultimately, we ended up getting it to the recommended fit, one pinky can slide between collar and neck. Mr E seems comfortable, has taken his "crow stance" a couple times, but no crow as of now. Will update again over next couple of days, but so far so good.