Japanese Clothing: Hadajuban (undershirt), Susoyoke (petticoat), and Han-eri (collar) 3-piece set

All three items are unused, but the susoyoke (underskirt) has yellow stains as shown in images 3, 4, and 5.
The hadajuban (undershirt) has a faint stain around the shoulder area.
The han-eri (half-collar) is off-white, not pure white.

Please consider this, understanding that these items have been stored for a long time.