This first item comes from a group belonging to a marine named De Boer. It is a little unusual - a child-sized commercial (it seems) woodland pattern suit with KMarns emblem and rank (Majoor der Mariniers) added. The rank is attached with Velcro, since there are no shoulder straps. Perhaps the marine De Boer had this suit made up for his son or nephew to play with?
There is even a name tape sewn above the back pocket on the trousers: