May be a weird / silly question, but wanted to ask here and see if anyone has some advice.

Background info: I have a cat we inherited after a family member's passing. She was overall healthy and happy but had a swollen bottom lip / chin situation that the vet said looked like a mild allergic reaction, and plastic food containers (which is what she had at the time) were likely the cause. Sure enough, within two weeks or so of bring her home and switching her to metal dishes, the swelling irritation went away 100%.

Skip to now where she's becoming more of an escape artist, so I got her a nylon collar with a hi-visibility stripe ID info printed directly onto it to better help ID her if she gets out / lost / etc. Initially she was of course a bit freaked out in the 'what the heck is this' sense on first putting it on her since she never wore a collar before, but adjusted to it really quickly and doesn't seem to mind at all that it's on - not fighting it / trying to back out of it / scratch it off / etc., just full on ignores it seems fully content with it.

However, we've noticed her itchy-scratching around her neck fairly often only two days into wearing it - she's not scratching at the collar itself or trying to take it off, she's just genuinely scratching at her neck around the area as if it itches really bad (despite no fleas and not doing this prior aside from the usual one here and there) and normally she only lets you scritch her on the head and maybe for a minute or so at most before swatting you away, but when I scritched her neck she *immediately* melted into it and tilted her head around to encourage full neck scratching for several minutes straight as if it was a major relief to her. Every time I go to scratch her neck after, same reaction - melting into it like it's the best feeling ever which is very cute, but unusual for her.

So, we're thinking she may have an all-over skin-allergy to plastic materials in general, including nylon.

With all that in mind:

• Since we really like the printed information hi-vis reflective stripe of her current collar, is there a way to make the collar allergy friendly?
  • I was thinking about sewing some fabric (maybe cotton or something similar) around the entire bottom strap (basically encasing everything that touches her skin and the top strap with the information / etc. is left as-is) so that the nylon doesn't make any direct contact with her skin, but would this be enough? Or could it still irritate her skin despite the fabric casing?
• Are there any other / better ideas on how to make her collar allergy-friendly for her skin?
• If not, are there any hypoallergenic collars that y'all recommend?
  • Must-haves: Brighter color (greens / pinks / neons / etc.) so it's visible against her dark fur
  • Would-prefer-if-possible: Ability to put ID info directly on collar to avoid tags, some sort of hi-vis / reflective material (or ways to do ID / hi-vis as DIY if no allergy-friendly collars offer it)