You raise an interesting point. But I think that
@yeah_93 is ultimately right; FF is a series with a LOT of fanservice. You might have a good point about the shirt, but if Cidney were just a classic male Cid, he wouldn't be in short shorts or thigh-high boots.
I'm honestly a little disappointed because the initial picture of her (the top one in the OP's post) as a woman covered in dirt and a trucker's hat without any particular feminine qualities seemed like a really promising chance for a different kind of female character. but then they go and make her another object to ogle. sigh.
that said, I'm still mostly glad they're playing around and doing something different with the Cid trope.