I decided against making a tag project, since I just cleaned out the flag bikinis with no specific flag tag* myself, but I wanted to a) save this search somewhere and b) maybe raise people's awareness of tagging the specific flag when tagging flag_bikini.
Also a sidenote: just because a bikini is red white and blue in a picture full of 'Murica it is only an american_flag_bikini if it has the specific elements of the american_flag.