Earn (one's) stripes informal verb phrase
To get a position through hard effort and experience.
Peter has yet to earn her stripes as a footballer.
Linda's earned her stripes by serving for years as a manager.
Deserve the pay or reward that you get because you do well
The verb "earn" should be conjugated according to its tense.
This phrase refers to a military promotion or reward, which is marked by chevron or braid strips affixed to the recipient's uniform and has been known as stripes since the early 1800s.
A humorous way of saying that what one has said is just what they acknowledge and may not be entirely accurate
Mike: Have you returned from your vacation on the beach? Your skin seems to get tanned.
Jenny: My skin is always dark. That's my story and I'm sticking to it!