frakach

In a sentence

• W balowych frakach tańczyli całą noc.

  They danced all night in ball tailcoats.

  Here, "frakach" is the locative case plural form of "frak", referring to formal attire called tailcoats.

• Uważaj na plamy, bo fraki są wypożyczone.

  Be careful with stains, because the tailcoats are rented.

  In this sentence, "fraki" is the nominative case plural form of "frak", referring to the same formal clothing in plural.

• Spotkanie odbywało się w eleganckich frakach i sukniach wieczorowych.

  The meeting took place in elegant tailcoats and evening dresses.

  Here, "frakach" is again in the locative case plural form of "frak", paired with "sukniach wieczorowych" to describe the formal attire of attendees.