The Straightjacket serves as a semi-boss near the final portion of Alchemilla Hospital before Travis Grady obtains the first piece of the Flauros and, like the nurses, are capable of using a grappling move. They can be found in every area of the game.
While they initially appear nearly identical to the Lying Figures of Silent Hill 2, they lack the feminine features of those creatures, and seem to be trapped in a "straightjacket" formed from skin, indicated by the notable folds and creases around their torsos. In contrast, the Lying Figures appear to be covered with a sheet of stretched skin.
At Artaud Theater, they have a significantly more bloodied appearance..
These monsters have a variety of attacks, such as spewing balls of acid while grappling rather than spraying it, as well as their ability to run at a surprising speed. They chase Travis Grady until he either enters another room/building or kills them. Outside, if the player does not react quickly, Travis can easily be swarmed by an infinite number of spawning Straightjackets roaming the streets. They will also jump up and wrap their legs around Travis, and if the player fails to successfully throw off the creature, it will spew acid into Travis's face, doing moderate damage. If one of these monsters is encountered alone, they are trivially easy for Travis to kill with even his bare hands, especially if he manages to attack them from behind or the side. They are the most common enemy in the game, which, combined with the ease of killing them, makes them quite useful if one wishes to gain the "Butcher" ending.
Straightjackets may be a metaphor for Travis being unable to escape his horrors, and feeling trapped inside himself, helpless to be freed.
Contrastly, this anomaly could also be yet another beastly manifestation of Travis's sexual deprivation. It mentioned in the opening that Travis has trouble with "finding the right girls", and other monsters in the game connect to this frustration. The manner in which the monsters wraps its legs around Travis and squirms about, sometimes even bending over backwards, can be seen suggestively.