Official, Following Rules, E.g. Black-Tie Event

This page is the CodyCross answer for the clue below from Cruise Ship, Group 643, Puzzle 3 (Oceanfront Promenade).

Question is: Official, Following Rules, E.g. Black-Tie Event

and the answer is: FORMAL

Word Meaning:

FORMAL — In accordance with established forms.

Definitions from Wiktionary.