I initially got a harness for my buns, but I felt that the rabbit harness, with just a strap around the neck and a strap around the back, still choked them when they pulled on the leash. I wanted something very comfortable for them to wear, that they could use when I took them out—they're microchipped, of course, but not a lot of people would even consider that a rabbit could be microchipped! So they have a Y front harness, so that any tension on the leash is distributed across their chest instead of on their neck. That way I have an extra safety measure in case they ever jump out of their stroller by way of leash (they never have but just to be safe) and also tags indicating that they are microchipped.
And PS: you have Bennie and Delilah, mine are Lahi and Delilah! But my Delilah is much bigger than her bunny hubby.
However, I did have a bad experience with a collar. Delilah is neurotic because of her neglectful first owner, and plucks Lahi's fur on his back, snatched him bald! So he wears shirts all day (after consulting with the vet to make sure it was okay) to protect his back. But trying to find clothes to fit a rabbit is SUPER HARD. I've had the most success with tank-top styles.
But I had a while where I was trying knit sweaters. I don't want them to be too constricting! But all too often the neck was too wide and he'd walk out the neck hole. So I started putting a collar under the cuff of the neck to keep it in place.
Well, one day, I was letting them out to play for several hours, and noticed nothing wrong... until it was time to go to bed, and I approached Lahi to discover that he'd managed to get his mouth around the collar, where his lower incisors had promptly trapped him like that. Now, it was a leather collar I'd chosen, quite thin, and he'd actually been millimetres from chewing through it and getting it off on his own... but if he'd panicked and started struggling he could have hurt his neck very badly. Their spines are just so flexible, and their necks are just so short! I haven't used a collar since.
The Y-front harnesses, Lahi and Delilah both used to gnaw at when I first started using them... so I would pull their neck fluff up through it, and now they can't reach the straps past their own neck blubber. Delilah's more than Lahi's, obviously, but now they don't bother with them at all.
But yeah, I'm in such a catch 22. Lahi is really not a fan of the clothes, he's learned to grudgingly tolerate them but I have to replace them every few months or so because he and Delilah tear them up. But if he doesn't wear them, Delilah plucks him down to the skin and then starts grabbing skin! And I can't separate them—Delilah's codependency and neediness are phenomenal, and Lahi will straight up stop eating if he's away from Delilah for more than 12 hours. He's 11 years old and I'm already constantly battling to keep weight on him, it's just not doable!
So, shirts.
He's got an orange one "Insert Snacks Here -->"
A black one "Will Do Tricks for Treats"
A pink one "100% Fabulous Around Here"
And a couple others.
Hilariously, this has been going on long enough that when I take the shirt off and let him run around without it, everyone comments that he looks naked! Not because of his bald spots, but because we're all simply too used to seeing him with clothes.