starchy

tärkkelyspitoinen, tärkkelys-

muodollinen, jäykkä Of or pertaining to starch.
Containing starch.
Having the quality of fabric starch as applied to fabric; stiff, hard; starched.
1942, (w), (w), “Sunday,”http://www.gutenberg.net.au/ebooks04/0400201.txt

Beds were made, the dinner-table set, and then we got into our very starchiest and most uncomfortable clothes for church.