According to Keller, Markle had "some idea" for what she wanted when they first met back in January, and they both "quickly agreed on the flawless dress".
She continued, "I do not think that her wedding dress was a copy of any of our designs".
Wickstead triggered a social media storm after she reportedly tweeted: "Her dress is identical to one of our dresses".More news: Why the Federal Bureau of Investigation wants you to reset your internet router
Wickstead also said that she thought the duchess' wedding dress didn't fit her properly.
With the help of her close friend, Canadian stylist Jessica Mulroney (whose family, including husband Ben and their three children, Brian, John, and Ivy, attended the wedding), Markle went through a list of potential designers, including Burberry, Ralph & Russo, Erdem and Stella McCartney.
The Daily Mail has also run a second story alleging that Wickstead's Twitter account was suspended, but according to a representative for her, this is not true; the designer has not used Twitter in years.More news: India rejects ‘unilateral’ US sanctions on Iran, Venezuela
The designer's statement saw almost a thousand commenters leave their thoughts on the post, with some feeling Emilia's comments weren't sufficient.
'I am extremely saddened that people responded to my comments that I totally made and meant but you guys took the right way and that's sad and I'm sad, ' wrote one commenter.
Emilia also commented on Meghan's hair and makeup, saying: 'I was like, 'Hold the wisps [of her hair] back - it's a Royal Wedding for God's sake'.
Finally, the designer concluded: 'I wish The Royal Highnesses, the Duke and Duchess of Sussex an awesome, happy and love filled life together, Emilia'.More news: Crowd told national anthem wouldn't be played, takes matters into own hands
She launched her eponymous label at the age of 24 in 2007.