Terrible! Save yourself money and anger, don't go here.
We first came to Tres Chic and, after many visits where I couldn't find a dress, the main store clerk told us to buy a dress that needed alterations because there wouldn't be a problem, we could return it without issue. When the seamstress said alterations weren't possible, we went to return the dress, but they suddenly told us there are no returns and wouldn't budge. Even though they said we could return the dress when we bought it, when we came to return it they initially told us we could return the dress and be refunded minus 10% of the cost. Then they said returning wasn't possible at all. This is a 1,000$ dress. We offered to buy 450$ shoes as an exchange and asked to receive the rest back. They wouldn't budge.
Absolutely horrible. Don't ever go there. They are overpriced and will try to trick you into giving them money.
They're also known to buy local designer clothes, change labels, and double the prices: http://www.tvanouvelles.ca/2017/12/14/il-change-letiquette-et-double-le-prix. Someone should really investigate their practices.