Learn Farsi: به نقل از روزنامه، لباس‌های مجلسی این برند گران هستند. - Quoting the newspaper, the formal clothes of this brand are expensive.

be naql az literally means quoting from or transmitting from, and is heavily used for media, reports, and written sources like ruznāme (newspaper). be gofte-ye means in the words of, and is more natural when quoting a specific person who spoke.

How does the word majlesi translate to "formal" in this context?

The base word is majles, which means a gathering, event, or assembly. By adding the -i suffix, it becomes an adjective describing something suitable for such an event. lebās-hā-ye majlesi specifically refers to formal wear, evening gowns, or party clothes.

There are multiple Ezafes in lebās-hā-ye majlesi-ye in berand. How do they logically link the phrase together?

The first Ezafe connects the noun lebās-hā (clothes) to its adjective majlesi (formal). The second Ezafe connects that entire descriptive chunk to the possessor, in berand (this brand), giving us the formal clothes belonging to this brand.

Why does the inanimate subject lebās-hā take the plural verb hastand instead of the singular ast?

While it is a common rule that inanimate plural subjects usually take singular verbs in spoken Farsi, using a plural verb is also grammatically correct. It is often preferred in formal, written language, or when emphasizing the items individually. Using the singular form here would also be completely fine.