A busy May 1938 day in Kasumigaura Kokutai. The "Akatonbo" are leaving the hangars en masse taking advantage of the clear skies.
Apart from the uniforms of the ground crew members and the pilots, of interest is the color of the trainers. Silver overall with red tails with the tail code repeated on the fuselage side in black as well as the top of the top wing and the bottom of the bottom wing. Curiously the "Willow" with the registration "カ (KA)-726" does not seem to have Hinomaru on the top wing and the tail code looks to be yellow.
Note how clean the planes are indicating perhaps a new batch.
An alternative and colorful solution if you want to avoid the "yellow-orange" vs "orange-yellow" "debate".