Maybe there is a local sporting goods store that could make you football, baseball, basketball jerseys with Mr/Mrs and whatever his (and now yours!) last name is... for the number you could either put the wedding year or maybe 01 and 02, and then when you have kids make them little 03, 04, etc....
My fiancee and I were thinking about doing that with Football jerseys. I've done some rudimentary geneology searches and I have not been able to come up with anyone in the USA (plenty in Canada) with the last name Sohor, other than my mom, dad, me and my brother and sister. I always joke around about how it's awesome that now there will be 6 Sohors in America after our wedding, so I suggested we get Jerseys that say "SOHOR 03" for me (since I'm the oldest kid) and SOHOR 06 for her, since she'd be the sixth member of the family...