starchy

adjective4

1. •
   Of or pertaining to starch.
2. •
   Containing starch.
3. •
   Having a starched personality; stiffly formal.
4. •
   Having the quality of fabric starch as applied to fabric; stiff, hard; starched.

   • Beds were made, the dinner-table set, and then we got into our very starchiest and most uncomfortable clothes for church. — 1942