SIL [23F] gifted me [27F] a sweet, but ugly cat necklace. Husband insists I wear it at all time so SIL's feelings aren't hurt, but I really don't want to look like a crazy cat lady.

This is a really ridiculous story I know but please give me some slack if I sound like a terrible person.
Anyways my SIL [23F] is a very, very sweet and kind person and is also on the spectrum (high functioning Asperger syndrome). As a result she can be slightly awkward and in certain situations very sensitive. My husband and his family try their hardest to make her feel comfortable and support her when she's forming relationships.
This is why what I'm about to tell you sounds so terrible. Last weekend it was my birthday, and we threw a small backyard BBQ for friends/family (SIL and in-laws live down the street from us, 5 min away). SIL approached me and gave me a small jewelry box with a really nice card. The card said something like she knows I have 3 cats that I love and she wants to gift me meant just for me.
Well, you guys I almost teared up at the thought behind the present. It was ridiculously sweet of her to think of something so personal and tailor made for me. HOWEVER, the necklace itself is...unique. I have 3 cats, 2 from my deceased aunt and 1 I've had for years. SIL got their pictures from my husband and commissioned an Etsy jeweler to make the cat's exact likenesses into these big photorealistic metal cut outs. The metal cut outs are strung on a chain to form a large, jangly necklace.
There is NO way to wear this necklace surreptitiously. Each of the cat "pendants" are roughly 2-3" wide, and together they make a symphony of loud jangles when I wear it on my neck. I simply CANNOT wear this necklace and forget about it. Either I wear it as a "statement" piece or I have to uncomfortably tuck it into my sweater/tops. And not to mention the sheer crazy factor of wearing pictures of your cats on your neck wherever you go.
I've talked to my husband and he also wants to see me to wear it constantly, because his sister randomly drops by our house and she'd want to see me wearing it. But he thinks it's the sweetest present she's ever given ANYONE, so I haven't really told him how I feel about it yet. I'm a bit worried because I don't think anyone shares my feelings, to be quite honest. Her parents and my husband all oohed and aawed at the gift (even when SIL was out of the room) commenting on how well the metalwork was done and how pretty the jewelry is and how this will be on my neck for years for sure...
How do I tell them that the necklace isn't my style and I'd rather not wear it out in public? Family events, sure, but out and about? I know how much SIL means to everyone and how this was a huge sign of acceptance from her. I'd hate to give people the wrong idea of my "fickleness" and turn sentiments against me.

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tl;dr: SIL gifted me a very sweet, but quite ugly "cat pendant" necklace. Husband and family expects to see me wear it at all times, but I think it makes me look insane. How to gently explain myself?


Source.

Bin it - say it must have broken and fallen from you while you were out and about.