You can of course by online on their famous website but while in Paris you should really visit one the A.P.C boutiques...
Kenzo's The Pont Neuf flagship store, shares the same building as the Philippe Starck–designed Kong, and is spread over three floors...
Amazingly, there are twenty six other cities and towns that share the name of Paris. There are 23 cities or towns in the United States alone, 2 in Canada, and 1 in Kiribati all named Paris. See the other Paris cities and towns.