Does this sound real? A guy on instagram asked me to model t-shirts?

[-L-]

yesterday, this guy posted a comment on 1 of my Instagram photos:

"Hey so this is a little random but im designing t shirts, and because you look supercalifragilistically cute, please can you help me out? By modelling my shirts. It will take 30 mins if you give me ur email i can send you the shirt (through PO box, if you want) and details? Also if you have any friends interested, please pass on my details, and you can do it together with your friends My company is still a work in progress, n' I know you will probably say no but im an optimist and i look forward to hearing from u because im just hoping you are a curious type haha."

And then he put his email, Skype, and the site (which i think looks pro). He has 3,000 followers on instagram, and 100's of comments/likes. All of his posted pics are of his t-shirt designs or himself chillaxing with friends (he looks like 20 - 25 yrs old)

So, does this sound real to you? Like do you think he's serious, or just posing to get girls? Am i supposed to reply?? He commented on some of my other pics during the last 2 months also.