Trajectory suit

This suit is a protective suit that belongs to Jesse Quick that she uses to conceal her identity when she's fighting crime. It was created by Eliza Harmon, and first worn by her, to hide her identity from her victims. Later, Cisco modified the suit a little bit and added a lightning emblem, right before Harry bestowed it to his daughter.

Original suit
When Eliza Harmon got hooked onto the speed drug known as Velocity-9, a suit was created to conceal her identity and to protect her when running at extreme speeds. While the creator of the suit is unknown, it is presumed to be it's user, Eliza Harmon.

Shortly after Eliza's death, Team Flash recovered the suit.

Upgrades
It was later shown that they kept it when Harrison Wells and his daughter Jesse Quick came back to Earth One and she was shown to have Speedster powers. The suit was given to her after Cisco added a black and white lightning bolt insignia on the chest.

Functions

 * Identity concealment: Eliza, later Jesse, uses a red mask to conceal her identity, to make sure nobody finds out who she really is unlike other speedster's suits this mask only covered the eyes rather than the whole head. Eliza also had her hair in braids to help further hide her identity while Jesse had her hair in a ponytail.
 * Intense temperature and abrasion resistance: Because Eliza can run at superhuman speeds the suit is heat resistant to make sure it never catches fire, it was shown when Eliza was killed by cellular deterioration and the suit was all that was left behind.

Known users

 * Eliza Harmon/Trajectory (deceased)
 * Jesse Quick