Graduation Suit for 145-150cm

Purchased for my older child's graduation ceremony in size 160cm for a girl's graduation suit. However, the skirt length was a bit short for my younger child who is 156cm.
I think it would be fine for children around 145-150cm. Worn only once, suit top and bottom have been dry-cleaned.
In the 5th photo, there is a faint stain or mark on the right chest area of the blouse.
It is hidden and not noticeable when wearing the jacket. Also, it's only visible if you look closely. I would like to sell this to someone who understands this.

The set includes the suit top and bottom, blouse, and tie (3 items).