Why would a guy ask "what are you wearing right now?"

Anonymous

this is a question for a friend of my teenage daughter. I've told her what I think the answer is, but sometimes you guys surprise me so I thought I'd ask you lol...she says every time she's on the phone or texting with her boyfriend he'll randomly ask her (about 3 times in a day) what she's wearing "um tshirt and jeans" or "tank top and pj bottoms" whatever the case may be and he'll say "Ok :)"
So, why would a guy ask "what are you wearing right now?"
why is he asking her that...thanks!

Updates
+1 y
fyi as I said below I told her it's because he wants a visual so he can think about taking it off(?)she being a naive teenage girl doesn't understand why he would even bother asking that I'm hoping to get a guys perspective to explain to her why he'd ask
Why would a guy ask "what are you wearing right now?"
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