Traditional ballet teachers can seem fussy about the dress code in their studios. There is a reason for this.
When a teacher is looking over a class in motion, visual clutter needs to be at a minimum. Dark leotards, white T shirts and pink, black or gray tights are a good uniform landscape for the teacher.
The black/dark of the leotard emphasizes the line of the posture, the upper back and neck suppleness/tension, the hip/leg break and alignment correctness, and makes it easiest to respond to what is seen with ongoing and detailed corrections.
Ballet Class Corrections
For instance, it is easy to see, even across a large studio, if the back of the thigh is not pulled up as needed, if the dancer is wearing pink or gray tights. It is also easy to see bulky tension in thigh muscles that should be more elongated.
Distractions such as multi-colored clothing, and sloppy leg warmers prevent the teacher from being at their top efficiency,
The artistry of ballet depends on the ultra-perfectionist and over-idealized form being sought, and then being surrendered to an allowing energy flow, that releases expression and drama.
I wish I could say that better, but all I'm really talking about is that the norm for strict ballet wear that any ballet store provides, ultimately supports the best results,as it allows the teacher to see what's going on in a large dance class full of diverse talent.
Get the best ballet wear and look like a pro in dance class.
The video below shows some younger boys in ballet who now wear the gray tights in class instead of the traditional black.