![1girl bangs black_hair blush bra breasts cleavage dress_shirt hair_between_eyes high_ponytail idolmaster idolmaster_shiny_colors jacket large_breasts lifted_by_self long_hair long_sleeves looking_at_viewer off_shoulder open_clothes open_jacket open_shirt panties ponytail scarf shirase_sakuya shirt simple_background skirt skirt_lift smile solo thighs underwear white_background yellow_eyes yuu_(asaiyuji) rating:s score:3 post #3891298](/cdn_image/preview/84/28/8428be210cc1c3eefa20b7ce3458e10e.jpg)
A shirt or blouse that has been unbuttoned and left hanging open.
Another possibility is that the shirt has been unbuttoned only in one particular part of the shirt/blouse, e.g. to see the breasts of a girl.
The following tags are aliased to this tag: /os, openshirt, and shirt_open (learn more).
This tag implicates open_clothes (learn more).