What to wear while appearing for Visa Stamping Interview?

I am going to appear for H1B Stamping in near time.

What shud one wear while apearing for interview?

Is it a good impression if wear formal shirt and pant with tie or shirt & pant are enough?

Is your dressing really matters?

Dress does not matter,business formals is not required. Wear anything comfortable and be confident.

Thanks vicky for the help