╚»★«╝ Reference 1: *Mentioned in Story Notes Prior to Reading* ╚»★«╝
Source: An image from NiHongo Master detailing the most common honorifics in Japan

-San : Most common honorific. It loosely translates to Ms. or Mr. This honorific is generally used among colleagues, classmates, and acquaintances that you are not very familiar with.

-Sama : The most formal honorific. It is used to refer to deities, royalty, and people of a higher status in extremely specific situations. It is similar to sir or madam but much more formal.

-Kun : Most often used for younger men and male teenagers. It is less for than -San and -Sama. It is usually used by people who are seen as superior, like a person of higher status talking to a younger person. The rules for -Kun aren't as straightforward or strict as other honorifics. *I believe Momo calls Todoroki as Todoroki-kun*

-Chan : Female version of Kun. It has an endearing tone and is mostly used for children. It can be used for female family members as wll in certain instances. It's most commonly used for girls, but it can be used for boys, too. Rather than being a strictly female honorific, it adds a sense of cuteness to a person's name. It is informal and incidates familiarity.

-Senpai : Used for people of higher status. This term is usually used in schools for upperclassmen, at work for mentors and higher-ups, and in other similar situations.

-Sensei : Translates to "teacher," but as an honorific, it can be used for authority figures such as teachers, doctors, politicians, and lawyers. It shows respect and acknowledges that the person has achieved a certain level of mastery in a skill set.

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╚»★«╝ Reference 2: *Mentioned first in II. A Secret Rendezvous * ╚»★«╝

Throughout the story we will read references to different 'Age of All Might' costumes. So far there have been a total of five All Might costumes mentioned in My Hero Academia, (06/04/24).
These Five costumes are in order of the picture reference below!

UA Days: This refers to when All Might was still attending UA High. This costume is only ever really shown during his one-shot called "All Might Rising".

Young Age: This refers to when All Might spent time abroad in America following his graduation from UA. It is shown in the movie Two Heroes. This was the first costume David Shield made for All Might.

Bronze Age: This is the unseen costume only shown in a small clip in Two Heroes. Not a lot is known about this costume or when it's era was.

Golden Age: This is the costume most commonly associated with All Might and usually seen throughout the series, This was likely his debut costume as it holds a lot of sentimental value for All Might and his fans.

Silver Age: This Silver Age costume is another one that is hard to pin down. He is shown wearing his Silver Age costume in a flashback of Vigilantes, when he was still working with Sir Nighteye. Roughly ten years before the story takes place.

Regardless, most of what we read All Might wearing is his Silver and Golden ages costumes. They are the ones featured in the anime and manga the most!

Source: u/ChronoKeep on r/BokuNoHeroAcademia on Reddit.
https://www.reddit.com/r/BokuNoHeroAcademia/s/Y57OVi5DVa