If by retro you mean vintage, then absolutely NOT. A vintage size 12 is the equivelent of today's size 9/10. Its just the opposite of what you think - vintage sizes run much smaller than modern sizes of today. Your best bet is to ask for measurements of the garment.
They run true to size
yes they do, some say it is a whole size, i feel like its a half a size.
About 1/2 a size small
Run My Renovation - 2010 Rad Retro Kitchen 4-3 was released on: USA: 30 August 2012
10
Guy's Big Bite - 2006 Guy's Retro Redux 12-5 was released on: USA: 29 April 2012
c
The simplified expression is 40 - 12s
Yes he did because I see baby's with the Jordan retro 13 and a kid who where size six with one
101
2
12s