What does he want to be? I remember when my DS was that age he was so into Toy Story & he had the pj's, so we used those as his costume for several years. There are also superhero pj's at kidsrus(link to coupon
http://www210.toysrus.com/our/kru/krucoupon.cfm )so you would get lots of use out of the pj's.
HTH
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