Starched

Dora's sitting up on the seat as prim as you please. She always looks as if she'd just been starched and ironed.

Source: tatoeba (7917486)

Karl Lagerfeld was an original, and was recognizable chiefly because of his white hair, black eyeglasses, starched collars and black, fingerless gloves.

Source: tatoeba (8102240)

Ninety-seven squirming little orphans must be scrubbed and combed and buttoned into freshly starched ginghams; and all ninety-seven reminded of their manners, and told to say, “Yes, sir,” “No, sir,” whenever a Trustee spoke.

Source: tatoeba (11902496)

I recall the height of comfort attained by the green-cushioned "first" with starched white antimacassars and a pretentious grey floor mat on which it seemed a sacrilege to stand, as it was embellished with the North Western conception of Britannia, complete with trident.

Source: wiktionary