The Black Pearl lingerie is the final reward that you can obtain once you've acquired all 49 can collectibles.
Collecting a certain number of cans nets you permanent boosts in Stellar Blade, increasing the maximum number of consumable items in your inventory.
The best way to obtain the Black Pearl lingerie is by following a can collectibles guide organized per region and unlocking the Can Detector upgrade for your drone.
There are two points of no return in the campaign, and missing out on important items might require starting over.
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