loop on back of dress shirt What is the purpose of the loop on the back of a men's shirt?

Marco V

4-way spandex stretch material

Designed as part of the AR Couture collection, Blush Reverie can be styled with a satin skirt for a romantic formal look, paired with high-waisted trousers for a chic evening outfit, worn for a bridal shower or engagement party, or restyled after the wedding season for future special occasions

Resort chic pleated midi dress, Yellow dress, Wedding guest dress summer

Also, sometimes companies send me their shoot sample (the actual item that they photographed on a model for their website) so theyll show light wear from that, so these lines honestly could have been there all along and I only noticed them after wearing it