Why not? Shirts might have flashy patterns, differently colored fabrics, alternating skin and shirt. On a row-per-row basis I can see the chest area being more entropic than a face with an even skin tone.

edit: I googled "woman" and selected random pictures which showed the whole upper body, entropy summed over each row to the right: https://imgur.com/a/oVB57gu

Seconded. I'm picturing my wife's choices in clothing--I would say often the highest entropy will be her top. And depending on the resolution and how good the entropy measurement is I can easily see her pants coming in second. (She tends to favor repeating patterns.)

(She has no work dress code she needs to conform to. Rarely does she wear a top as plain as any of your examples.)