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Terminology

Japanese

乳 (chichi, lit. milk) is the japanese word for breast.
胸 (mune, lit. chest) is the japanese word for chest.
おっぱい (oppai, child language) less formal way to design breast like boobs or tits.

Breast size terms
Japanese	Romaji	English lit.	English
無乳	munyuu	no breast	Flat
ぺったんこ	pettanko	flattened (Onomatopoeia)
絶壁	zeppeki	cliff
ちっぱい	chippai	Small breast (slang)	Small breast
貧乳	hinnyuu	small breast
微乳	binyuu	small breast
普乳	funyuu	normal breast	Medium breast
豊乳	hounyuu	large breast	Big breast
巨乳	kyonyuu	big breast	Big breast
爆乳	bakunyuu	explosive breast	Huge breast
超乳	chounyuu	super breast	Gigantic breast

Other

French: sein

Italian: seno

German: brust

Swedish: bröst

Kanmusu

Type and Size

There is some (never expect consistency from this game anyway) consistency of size among the ships of the same type.

DE

For DE it's simple they are all flat. Which is normal considering they are all pre-teen.

SS

Most submarines are either flat or have small breasts with some medium breasts and the notable exception of some old submarines having big breasts: I-19, I-8, I-26

DD

Kamikaze-class
- Difficult to say with their kimono but seems to be small or medium.
Mutsuki-class
- Mostly flat with maybe some small.
Fubuki-class
- All small with maybe some flat under their uniform.
Ayanami-class
- Mostly small with the exception of Oboro and Ushio.
  - Girls drawn by drew seem to systematically have smaller breasts in swimsuits...
Akatsuki-class
- The nanodesu have nano breasts, desu.
Hatsuharu-class
- All small or flat except for Ariake and Yuugure.
  - So in terms of bust, the Ariake subclass does exist...
Shiratsuyu-class
- Generally small at base and big at Kai Ni as this class consistently benefits from the remodel effect...(except Kawakaze).
  - Harusame is only promoted to medium at Kai Ni.
  - Kawakaze is flat and [math]\displaystyle{ 0 \times \text{Mod}_\text{boobs}=0 }[/math] so no upgrade.
Asashio-class
- All are flat with the notable exception of Natsugumo (small) and Minegumo (medium).
Kagerou-class
- Boobs subclass can be made depending on the artist.
  - Konishi flat with an upgrade to small at Kai Ni and for exception Oyashio and Hagikaze being big.
  - Shizuma Yoshinori All flat.
  - Parsley the well known "D-cup DD" trio of Urakaze, Isokaze and the biggest DD Hamakaze!
    - Who is Tanikaze? What do you mean Akigumo isn't a Yuugumo-class?
Yuugumo-class
- Mostly small and medium with some big at Kai Ni Like Yuugumo and Naganami.
Akizuki-class
- Big, with Akizuki and Hatsuzuki Kai Ni being medium.
Matsu-class
- Medium except Ume] being big.
Shimakaze-class
- Shimakaze is hydrodynamic.
Z1-class
- As small as their stats...(flat).
Maestrale-class
- As flat as the wall of a prison cell.
J-class
- Difficult to say but seems to be at most small.
Tashkent-class
- Medium breasts that protect against the cold.
Fletcher-class
- Big, with Fletcher being amoung the biggest of the DD.
Samuel B. Roberts
- As flat as a DE.

CL(T)

CL
- A lot of medium/big with a rather consistent one small for each class (except Tenryuu and foreigner).
  - Small CL:Kuma, Nagara, Abukuma, Naka, Yuubari, Sakawa, Ooyodo.
CLT
- Flat, medium, big.
CT
- Big, big, big.

CA(V)

A lot of medium/big with for exception Mogami, Mikuma, Kumano and Tone being small.

CVL

50/50 between small and big (with some close to medium)

CV

Literaly Go from flight deck level of flat (cough Taihou cough) to one of the biggest pair in the game.

(F)BB(V)

fGo from medium to huge.
- Jean Bart despite being rather hard to determine excatly is clearly the smallest amoung battleship being small/medium.

AX

AS
- Whales are big ,dah~.
AO/AR/AV
- True to themselves, auxiliaries are never consistant in this game...and go from flat to huge.

Remodel

Indeed the bust size is one of the stats increased by a Kai Ni. This have been explicitely shown during the 2015 anime with Yuudachi Kai Ni during episode 9. Note that it is also shown that Fubuki didn't get a bust upgrade during her own Kai Ni. Also during the more recent KanColle 1944 anime despite not being acknowledged by the characters, Shigure Kai San clearly got an upgrade in the bust department. So it does happen. However, determining if a specific ship got a bust upgrade can be tricky as we often only have two drawings as references sometimes a lot of time between the two. Artists are not perfect and their styles change with time. In addition, a lot of them don't always take this upgrade into account when drawing seasonnal CG. For example Yuudachi in her Halloween CG has the same bust at base and Kai Ni. So if a ship doesn't appear in the following list it either doesn't get an upgrade with Kai Ni or is undetermined.

Type	Ship	Before	After	After+
DD
	Murakumo
	Shiratsuyu
	Shigure
	Shigure
	Murasame
	Yuudachi
	Harusame
	Umikaze
	Yamakaze
	Kagerou
	Oyashio
	Hayashio
	Yuugumo
	Okinami
	Kiyoshimo
	Hatsuzuki
	Fletcher
CL	Tenryuu
	Tatsuta
	Tama
	Isuzu
	Gotland
	Ashigara
	Maya
	Choukai
	Zara
CVL	Hiyou
CVL	Junyou
FBB BB BBV	Kongou
	Hiei
	Haruna
	Kirishima
	Nagato
	Mutsu
	Yamato
	Musashi

Note

Okinami need to change her bra it's clearly too small now.
Kiyoshimo got a bra after her Kai Ni.

Abyssalification effect

In KanColle The Movie it is clear that the Abyssal Fubuki has a bigger bust than Fubuki. Indeed the corrupted kanmusu commonly called Abyssals are often quite recognizable despite the different appearance which sometimes includes a different bust size.

Type	Ship (difference)	Kanmusu	Abyssal
DD	Murasame (Kanmusu > Abyssal)
	Minegumo (Kanmusu > Abyssal)
	Hayashio (Abyssal > Kanmusu)
	Hagikaze (Kanmusu > Abyssal)
	Suzutsuki (Abyssal > Kanmusu)
	Fletcher (Kanmusu > Abyssal)
CL	Naka (Abyssal > Kanmusu)
	Duca degli Abruzzi (Kanmusu > Abyssal)
	Honolulu (Kanmusu > Abyssal)
CV/CVL	Ark Royal (Abyssal > Kanmusu)
CV/CVL	Gambier Bay (Abyssal > Kanmusu)
FBB BB BBV	Bismarck (Abyssal > Kanmusu)
	Conte di Cavour (Kanmusu > Abyssal)
	Washington (Kanmusu > Abyssal)
	Richelieu (Abyssal > Kanmusu)
	Gangut (Abyssal > Kanmusu)
AX	Yamashio Maru (Abyssal > Kanmusu)

We are close to a 50/50 with a slight advantage fro the abyssal. The logical conclusion is that the Abyssification phenomenon most of the time doesn't affect the bust size with some exceptions going either bigger or smaller.

Underwear

This section will list what kanmusu use to cover their breasts under their clothes. Which don't include only bra. Also for a lot of kanmusu it's eiter undermited or they doesn't wear anything.