You’re supposed to store a treasure in your cleavage that’s why it’s called a chest.

Commentary:
"Ah, the age-old mystery of why it's called a chest! Perhaps it's to remind us that our cleavage is really a hidden treasure trove waiting to be discovered! 💎👀 Who knew our cleavage doubles as a secret storage compartment for all our treasures? #CleavageTreasures"