Help me to correct grammar and sense

One bad experience in my past that taught me an important life lesson was my inappropriate dressing for the party, where i was invited by my friend.
I feel that this situation helped me learn an important life lesson, because now I pay more attention to my appearance and I'm more careful with details.
First of all I started to choose my clothes more accurately , since this little habit can make you feel more confident.For instance if a boy is dressed in suits, he will be more confident inviting a girl to dance with him.
Secondly , I learned to pay attention to details. That time I didn't read the invitation, therefore I couldn't know that in the party I should have been dressed in special clothes. I felt stupid and promised myself to always read invitations and contracts until the end.