Recommend some loose-fitting cotton shirts that I can wear with the sleeves rolled up during the day and buttoned up in the evening.

Here are three shirts made of 100% cotton with a relaxed oversized or boxy fit, making them versatile to style. If you are looking for a clean white, one made of bio-washed cotton or one using textured dobby fabric would suit you; if you want a subtle pattern, a check shirt whose fastening can be changed with a hidden button is a great option. All three products are in the late KRW 100,000 range.

Here are three cotton shirts with relaxed silhouettes featuring stripe patterns. They range from a lightweight, boxy fit shirt with a hidden button feature, to one with lapels and a double-button closure, to a henley neck shirt highlighting stripe patchwork details. Stripe shirts made with a slim fit were excluded as they did not meet the loose fit requirement.

Here are three cotton shirts with relaxed silhouettes featuring check patterns. They divide into a 100% cotton boxy fit that lets you switch styling with an inner hidden button, a boxy fit made of sheer, subtly see-through fabric, and a moderately oversized fit with a quiet windowpane check. Check shirts in standard fits or cropped lengths were excluded as they did not meet the loose fit requirement.