Full-size shoulder/bust form for AN-J-3A... made of a safe material?

[BigBrother]

So I hang virtually all of my nice vintage suit jackets, leather jackets, etc. on wide polypropylene shoulder sleeves, these here:

BUMERANG shoulder shaper for hanger, white - IKEA

BUMERANG shoulder shaper for hanger, white This shoulder shaper preserves the shape of your finely knitted sweaters, suit jackets or silk blouses and fits perfectly on BUMERANG hanger. Preserves the shape of your knitted sweaters, suit jackets and linen blouses/dress shirts.

www.ikea.com

Why do I specify the material? Because it's inert, as opposed to PVC which I've been warned against.

I don't own any serious vintage leather except for one AN-J-3A, which I'd really like to keep on a full-size form that ideally can be hung, like this:

https://www.amazon.com/Male-Molded-Black-Shirt-Form/dp/B07JZTDBRZ/

But I want to avoid anything cheap/potentially damaging over time. Does anyone know of something high quality like this that is of a known stable material for preserving fine vintage?

Thank you!

 

[Shanghai-Mayne]

I use the same hanger, for short period storage, like 2 weeks.