Libgdx/Box2D PolygonShape has no position… well, what now?

As my prototype works perfectly fine I want to advance to more fun areas of the project and add a more complex player-character body.

So for Box2D I figured I’d need multiple fixtures, like one for the legs, one for the torso and one for the head.

Each of these fixtures will get a different sprite/texture that should be swappable dynamically if the player puts on some armour or changes cloths etc.

Until now the player-character consisted of a Box2D Body with just one single fixture.
I added the sprite like this:

   body.setUserData(this.sprite);

I rendered it like this:

 // Draw-method
  if(body.getUserData() != null && body.getUserData() instanceof Sprite) {
      Sprite sprite = (Sprite) body.getUserData();
      sprite.setPosition(body.getPosition().x - sprite.getWidth() / 2, body.getPosition().y - sprite.getHeight() / 2);
      sprite.setRotation(body.getAngle() * MathUtils.radiansToDegrees);
      sprite.draw(spriteBatch);
  }

Now that I want to have multiple sprites for different “regions” of the body I figured it’s better to add them to the fixture itself. For now I just wanted to reproduce what I already had, so just the one sprite I have to the one fixture I have right now instead of the body.

I do this like that:

Fixture fixture = body.createFixture(fixtureDef);

My problem arises when trying to render this.

for(Fixture fixture : body.getFixtureList())
{
    if(fixture.getUserData() != null && fixture.getUserData() instanceof Sprite)
    {
        Sprite sprite = (Sprite) fixture.getUserData();
        //sprite.setPosition(fixture.getShape().getPosition() ... // Not gonna work, because PolygonShape has no position!  
        sprite.draw(spriteBatch);
    }
}

As you can read in the comment, the fixture for now has a rectangular shape which is made like:

shape = new PolygonShape();
shape.setAsBox(widthInMeters / 2, heightInMeters / 2);

The problem is, that a PolygonShape has not position :/ Now when I render this, the sprite is not being drawn at the fixtures position and currently I really have no idea how to fix that.

I’d highly appreciate any help you can give me! Thanks in advance and have a wonderful day!