What is this little slot for? Carrhartt overalls : r/Tools

Freshley Drop Seat Overalls in Black Stretch Thermal Denim

Carhartt Men's R37 Zip-To-Thigh Chap Unlined Front Bib Overall

Carhartt® Infants'/Toddlers' Loose Fit Canvas Bib Overall

Carhartt Super Dux Relaxed Fit Insulated Bib Overall - CLAD

16oz Waxed Canvas Work Apron with Tape Holder - Fully

What is this little slot for? Carrhartt overalls : r/Tools

Carhartt Women's Full Swing Cryder Bib Overalls, black, XXL Tall

Carhartt Master Cloth Sanforized Toddler Overalls Blue Denim

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MENS 36 x 30 - Carhartt R08 Unlined Denim Overall Bib