XS suit

The Flash suit is a protective suit that Iris West wore as the temporary meta-human known as the Flash.

History
Initially, Iris used the suit's jacket as normal apparel.

After Matthew Kim transferred Barry Allen's DNA to Iris's body, she gained Barry's powers. When there was a fire in Central City, Cisco gave her a spare mask belonging to Jesse Wells in order to conceal Iris' identity.

When Jaco Birch started attacking Central City with his newfound pyrokinetic powers, Cisco modified Iris' jacket presumably to become friction-proof. After she apprehended Birch and Matthew restored Barry's powers to his body, Iris presumably abandoned the suit.