How do you unlock the custom flame trunks in fight night round 3?

To unlock the custom flame trunks in Fight Night Round 3, you need to achieve a specific milestone in the game. Typically, this involves completing certain challenges or reaching a particular level in the career mode. Make sure to check the game’s unlockables section for detailed requirements or tips on how to complete them effectively. Once achieved, the trunks will be available for your boxer to wear.