Is a photo of black clothes with a white background a black and white photo?

No, this is actually a color photo.

black and white photography is short for black and white, and it is better to collectively refer to black and white photos. Monochrome photos refer to black and white photos. Terminology as opposed to color photographs.

when there are too many colors in the photo, making it black and white will reduce some interference. However, black-and-white photos can't be directly decolored. How much contrast is needed, where is bright and where is dark, whether the transition is delicate and oily or as sharp as a knife, and whether or not to make a final color cast depends on the personal cultivation of the retoucher.

Black and white can not only highlight the relationship between light and shadow, light and shade, but also enhance the contrast for good works; For bad works, you can also erase all the color disharmony. In other words, assuming that the photographer's skill is average or the film is average, then black and white can kill the defects of the characters themselves and the disharmony of the background environment.