Also we did not get a good look at the blue material from the spaceship in the movie so the costume could have been in the spaceship already complete with s symbol, Put there by his father for the trip However I think the yellow s symbol was seen on the red material when baby Clark lifted the truck off of his adopted father. Clark Kent did have a bag when He went to the Antarctica to build the fortress of solitude, In the bag was the suit from the spaceship, And a green glowing crystal glyph, Containing a message and the power to recreate Krypton technology.