What you wear to an audition is important.
The acting is more important.
Learn to make your decisions on hair, wardrobe, and makeup quickly and clearly. You are auditioning for similar types of roles, so learn the colours and styles that suit your types.
In this way you won’t have to re-invent the wheel each time. Once these decisions are made you can get on to the acting.
Listen to professionals who say which colours suit you, and pay attention to Hollywood’s iconic colours: grey T-shirt is the shirt of choice, TV likes blue, black is everywhere etc.
You only need one piece of clothing per type, which you can wear over and over to auditions. You can buy cheap versions of designer clothes.
Wearing an expensive designer outfit won’t get you hired.
And you don’t want to be preoccupied during an audition worrying about your clothes or your hair. If all the guys in the waiting room are wearing black boots and you’re wearing runners – it’s not important.
Be sure you can support what you wear to the audition. If the shirt is too tight or the skirt too short and it makes you self-conscious change into something else. Self-consciousness is the enemy of the actor, you don’t need to add to it.
Wearing what you like should create more space for you.