Definition of "shirted"

Maury rocked his chair onto its back legs, rubbed his shirted stomach, grinned.

1988 July 8, Muriel and Maury Schmidt, “Sunday Afternoon in a Motel Room With Derrick”, in Chicago Reader‎

You walked towards my path but you just brushed right pastAnd into the arms of that fucking white shirted man.

2004, The Streets, Fit But You Know It