Silk as a fabric type: ultra-lightweight and strong. Spider webs yield a bundle of webbing, which can be carded and spun into silk. You can also have silk parachutes as possible scavenge from soldiers and military outposts/bunkers. Silk can be unravelled just like rags to produce threads too. Silk inserts in clothing makes it fancy (or fancier) and water resistant. Various types of fancy new clothing would also become available: silk blouses, silk slippers, silk gowns, silk scarves, et al.
Allow honey to be applied as antiseptic. Also, honey + rag = bandage.
Very rare spray cans of hydrophobic coating which can be used to make clothing waterproof.
Fresnel lens which can act as a forge + hotplate in direct sunlight (and set fires like a magnifying glass). (Speaking of which, why can’t a forge be used to cook food?)