"Dressed for success" is a phrase which means how well the clothes that you wear will affect whether you will become successful or not in the future. However, "dressed for success" has another meaning for me.
I think it should mean that people have to wear the right clothes in the right situations. For example, if you are going to an interview, you shouldn't, and you couldn't wear a pair of sandals or your pajamas. Otherwise, you will not do well at your interview. In my opinion, people should wear black clothes at interviews because black is formal and normal.
People need to care about the "details" in their clothing. Such as, remember to button the top Button on your oxford shirts and always iron your clothes. Most of the time, people care about the details in the clothing more than the clothing itself.
In conclusion, "dressed for success" means make sure every single "detail" is perfect and always wear the right clothes in the right places.