I think the question of weathering fabric would be best addressed on a site like The RPF.
It's a chat forum dedicated to costuming and props and the subject of weathering various materials comes up nearly every day.
The members there have vast experience is ageing/weathering pretty much anything and will be able to share how to weather your particular fabric.
Also there are very many YouTube videos concerning weathering fabrics, by people who do it professionally as well as by experienced hobbyists, if you don't want to visit The RPF.
Proud Mountaineer from the Highlands of West Virginia; son of the Revolution and Civil War; first Europeans on the Guyandotte
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