it probably is because all lacoste clothes are mad with the same type of brand you got ripped off and those lacoste shirts arent cheap either im only 14 and i would stick with american eagle and aerpostal and ab-n-fitch.
$75.00 or $80.00 you can look on their website!! www.lacoste.com I have a blue one!! They Rock!! =] Hope this helps!!
They are all men's sizes. Size 3= US XSmall, Size 4=US Small, etc. So, if the shirts you bought say "3" then chose XS/EUR3. Hope this helps.