Captains and Etc.

If you can't read all this, then here's the link: http://bleach.wikia.com/wiki/Gotei_13 -Same place for the way to become a captain-

Spoiler:

-I hope you can see this-

Flowers & Meanings

Division/ Flower/ Meaning
1st Chrysanthemum Truth and Innocence

2nd Pasque flower Seek Nothing

3rd Marigold Despair

4th Bellflower Those Who Grieve Are Loved

5th Lily of the Valley Sacrifice, Danger, Pure Love, Humility, Sweetness

6th Camellia Noble Reason

7th Iris Courage

8th Bird of Paradise Everything is Obtained

9th White poppy Oblivion

10th Daffodil Mystery, Egoism

11th Yarrow Fight

12th Thistle Vengeance, Strictness, Independence

13th Snowdrop Hope

Uniform Customization
Gotei 13 officers, particularly captains and lieutenants, often customize their personal appearance or that of their uniform. Some of these modifications include:
Captain Soifon of the 2nd Division wears a sleeveless and backless Shinigami outfit (when she is fighting) under her haori, which is standard issue for the head of the Onmitsukidō. She also wears a yellow sash a layer above, but slightly lower than her white one.
Captain Retsu Unohana of the 4th Division wears an obi sash rather than a standard one.
Captain Byakuya Kuchiki of the 6th Division wears an extremely expensive scarf named ginpaku kazahana no uzuginu and a white ceremonial hairpiece called kenseikan, symbolizing his noble lineage.
Captain Sajin Komamura of the 7th Division wears shoulder guards over his haori and large gloves which go up to his arms. He also wore a helmet to hide his appearance, but he later removed it.
Captain Shunsui Kyōraku of the 8th Division is probably the most flamboyantly dressed of the captains, always seen wearing a straw hat and a gaudily-colored kimono over his uniform.
Captain Kaname Tōsen formerly of the 9th Division wears an orange scarf with his outfit, a sleeveless kosode as well as white boots.
Captain Tōshirō Hitsugaya of the 10th Division wears a green sash pinned with a star around his shoulder to hold his sword.
Captain Kenpachi Zaraki of the 11th Division wears a jagged edged haori, which was taken from the previous captain.
Captain Mayuri Kurotsuchi of the 12th Division wears a bloated purple cravat and a hat decorated with two horizontal spikes, he later changes the hat.
Lieutenant Chōjirō Sasakibe of the 1st Division wears a jinbaori over his Shihakushō.
Lieutenant Shūhei Hisagi of the 9th Division wears a sleeveless kosode and black choker.
Lieutenant Rangiku Matsumoto of the 10th Division wears a top that is deliberately loose and hangs open to reveal her ample bosom. She also wears a pink scarf (or stole), and wears her lieutenant's badge around her waist with her sash, tied in a bow.
Lieutenant Nemu Kurotsuchi of the 12th Division has a very abbreviated outfit: the hakama is absent, leaving her with a mini-skirt version of the kosode that is belted at the waist.
All known members of the 9th Division, excluding Mashiro Kuna and Toshimori Umesada, wear kosode without sleeves, including the former captains.