Me to my son (age 6): "I wouldn't do that if I were you." My son to me: "if you were me, you'd like what I like, and do what I do"
One of the great challenges when it comes to dressmaking, is understanding that the client's vision isn't necessarily your vision, and what they like, isn't necessarily what you like. There are jobs that should be turned down for this reason. How do you learn that?
The hard way.
Sometimes a client will ask you to create something that you are excited about, and can see clearly in your head. Then, when you create it, the client is disappointed, or says that it isn't what she wanted/expected. Doesn't matter how good you are at your craft, this will happen.
So what do you do? You change it. You listen in a little closer. You figure out a solution that is fair to you both. You try to pull in any lesson(s) you can from the experience. Then... you move on!