A thumb rest is more an item of utility, not style, or at least it is in my opinion. I don’t know anyone installing a thumb rest for looks unless it’s on a vintage or vintage reissue bass to make the bass look original.
In my opinion, the thumb rest on a PBass was put in the wrong place & should have been just above and parallel to the E string and located between the pickup & bridge.
Thumb rests lost a lot of their utility when two-pickup basses became more common, so they mostly reside on single pickup basses, like PBasses, where they were born.
It’s unlikely they will gain style or utility.
In my opinion, the thumb rest on a PBass was put in the wrong place & should have been just above and parallel to the E string and located between the pickup & bridge.
Thumb rests lost a lot of their utility when two-pickup basses became more common, so they mostly reside on single pickup basses, like PBasses, where they were born.
It’s unlikely they will gain style or utility.