How do I get the Formal Dress outfit from the 25 anniversary?

Question

What is the name of this outfit and its achievement?

How can I get it?

Does it have addons or is only a base outfit?

Comments

The first thing you have to do is to wait for the outift to be implemented in the game. Please, consider phrasing your question on the future tense.

Answer 1

The Formal Dress Outfit¹ is a reward for finishing quest with the final boss- Lord Retro.- 25 Years of Tibia Quest²

Upon completing the quest we will receive base only. In the order to get full Outfit we have to use items: 

Brass Button- For First Addon

Decorative Plume - For Second Addon

Both of the items are very rare loot from Lord Retro Boss (Retros Tresure) and will not disappear once used- can be used by many characters. 

Upon receiving Full outfit- you will receive achievement " Sharp Dressed"

Teaser of 25th Anniversary:

However, this experience will not only encompass the dungeon, as a new quest will send you across Tibia, and eventually set you against the boss Lord Retro. The rewards for your efforts are a new backpack, mount, and outfit, as well as Theons. ³

1. https://tibia.fandom.com/wiki/Formal_Dress_Outfits_Quest

2. https://tibia.fandom.com/wiki/25_Years_of_Tibia_Quest

3. https://www.tibia.com/news/?subtopic=latestnews&id=6429