1) The tailor added a stiffener to the collar of the shirt.

2) You can use a stiffener to make the brim of a hat more sturdy.

3) The dressmaker used a stiffener to give the dress more structure.

4) The carpenter installed a stiffener to reinforce the beam.

5) A stiffener was inserted inside the bag to keep it from collapsing.

6) The shoemaker used a stiffener to add support to the shoe's heel.

7) A stiffener was glued to the back of the book cover to make it more durable.

8) The engineer recommended adding a stiffener plate to the steel structure for added strength.

9) The artist used a stiffener to make the canvas more rigid for painting.

10) The costume designer sewed a stiffener into the collar of the character's jacket.