imperial robes
袞 centers on formal imperial robes, specifically the dragon-embroidered ceremonial attire of an emperor.
袞 combines 衣 (clothing) with 㕣, which likely contributes the sound and may relate to the idea of flowing or dragon patterns on imperial robes. The exact historical development of the inner component is uncertain.
The outer 衣 (clothing) wraps around the inner 㕣, which looks like a stylized dragon or emblem. Picture an emperor wearing a robe richly decorated with dragon patterns: 袞 is the imperial robe.
For コン, imagine a con artist trying to steal the emperor's robe: con -> コン, and the robe is the target of the con.