Why is the answer 'backs'? Is is the substitute for 'body'?

[Eirene]

English Grammar Tests, Elementary Level

ESL/EFL Test #124 "Real Life: Accessories and Clothing (1)", question 4

Both men and women wear shirts on their ..........

(a) necks
(b) feet
(c) backs
(d) eyes

English Grammar Tests, Elementary Level

ESL/EFL Test #124 "Real Life: Accessories and Clothing (1)", answer 4

Both men and women wear shirts on their backs.

Correct answer: (c) backs

Your answer was: correct
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Hello.
I'd like to ask the explanation for the answer. Why is the answer 'backs'? Is is the substitute for 'body'?
Thanks for your explanation.

[Kitosdad]

Yes it is, but a very confusing one, as your question illustrates. Body would have been preferable.
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Englishman living in Germany.