please help explain the season codes! 09c, 09p, 09a etc

danae

frou frou
O.G.
Feb 28, 2006
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NYC
What do the letters after the year mean and when does each collection come out?

I searched but couldn't find anything related to my question.

I'm mainly asking for costume jewelry, but I guess it also applies to RTW and bags, right?

Take for example 2009...
First comes 09c which I guess is the Cruise collection which comes out in November, then 09p which is summer Pre-collection, then 09a which is ...?