Kate Middleton's designer opened up on what it was like when she first met the Duchess of Cambridge when she needed help for her son's clothing.

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On Tuesday, Hello! Canada shared an interview with Amaia Arrieta who assisted Middleton when she arrived to the childrenswear store Amaia Kids to find clothing for her son, George, when he was just a few weeks old. Middleton just so happened to show up in the store with her mother when she came up to Arrieta and asked if she could help her.

"Of course we knew who she was!" Arrieta said. "It surprised us to see how normal and natural she was. We helped her like any new mum and I think she liked that because she's been coming back ever since."

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The designer gave more details on what it's like every time Middleton comes in; she knows what she's looking for, but is always willing to take suggestions.

"She usually comes alone and although we show her everything we have in the size she needs, she usually knows what she wants," Arrieta said. "She's very decisive but she does let us make suggestions, and sometimes she buys things she wouldn't have picked up. She's very charming, very normal and very sweet."

Arrieta then revealed what the duchess bought the last time she was there when she was close to giving birth to her daughter, Charlotte.

"Three weeks before the princess was born, she came in and bought three cardigans, three shirts, two pairs of shorts and long socks," the designer said.