Males are using Qandhoora (White Color)
Females are using Abaya (Black Color)
the kandoora or dishdasha.
Women in Dubai wear abbayas
Women wear a black dress, the Avaya.
Dress is what is meant by attire. You may receive receive an invitation specifying formal dress. That would mean formal attire. It is what you are wearing.
causal attire
a dress
The beautiful dress
enrobe
The Eldar Harlequins dress in clownish attire.
The word attire refers to clothing, formal or dressy in particular.
The venue often dictates the dress code. Formal venues like ballrooms suggest formal wear (black-tie), while beach weddings might be semi-formal or casual.
Business attire
The dress code for the Union League Club of Chicago is business casual attire in general. Special events however require higher forms of attires, such as business dress attire.
Evening attire is nice clothing. For men, evening attire will be a nice tailored suit. For women, its a nice evening dress, usually black.
Upscale attire generally means to wear a professional outfit. This consists of dress pants, shoes, and a tucked in undershirt. For women it means to wear a gown or dress that is classy looking.