noun
cotton goods; cotton clothing
Refers to items made of cotton, especially clothing or fabric products. A straightforward compound noun.
この店では木綿物を多く取り扱っています。
This store carries a lot of cotton goods.
夏は木綿物の服が涼しくて快適だ。
In summer, cotton clothing is cool and comfortable.
木綿 refers to cotton as a material, while 木綿物 refers to items made from that material.
Compound of 木綿 (もめん, 'cotton') and 物 (もの, 'thing, goods'). The exact historical derivation is straightforward.