denim breaker
n. A person who breaks in a pair of jeans for someone else to wear.
Examples
2014
All these jeans have been worn by 'denim breakers,' volunteers who offered to break the jeans in, and agreed not to wash them for six months.
—Anneta Konstantinides, “Would you pay for jeans that haven't been washed for six months?,” Wales Online, December 01, 2014
2013
So, here’s the idea.

You are going to break our selvedge jeans in for our customers.

You will have to agree to not wash them for 6 months.

You will have to agree to update what you get up to in them on HistoryTag.

And before you get them sent to you have pay a small deposit, which we will refund on their safe return.

When we get them back, we will expertly wash them.

And then we will sell these beautiful jeans.

You will have 20% of the sale.

So in effect you will be paid to wear jeans.
—“Denim Breaker Club (Beta Test),” Hiut Denim Co., June 05, 2013
2009 (earliest)
denim breakers..we're artists too. except we're using jeans as our canvas.
—Muhammad Juliansyah, “denim breakers…,” Twitter, October 09, 2009
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