Disneystore.com purchase, can you exchange in the parks???

[jrnunzio3]

Hi all,
Recently made a purchase at Disney Store.com and the item is too big on me. This is a park merchandise jacket. Will I be able to return it/exchange it while I am at the parks or at DTD while I am there in 3 weeks or do I need to send it back to Disneystore.com and exchange it there???

It would save me shipping costs to do it while on vacation.

Thanks for your help!
Jenny