Shinji, standing on a pier in the pool, with Unit-02 in the foreground. He is wearing Asuka's plugsuit and his feet are turned inwards.
SHINJI:“Hey, why'd we change into plugsuits?”
ASUKA (OFF):“Are you stupid?”
Javi2541997: The only time we've ever seen Shinji with the red suit.
UrsusArctos: True, we never again see a pilot wear another pilot's plugsuit, and it looks horribly uncomfortable.