Kaizoku pirates of sixteenth-century Japan wore simple armor with family badges on the breast plates, shirts, and trousers. On their feet they sported sandals made from straw. The wako of the 1540s kept their legs and feet bare. They wore white loincloths and loose jackets tied with straps sewn into the seams.
http://www.cindyvallar.com/dress.html
The answer—courtesy of the Wall Street Journal and Mythbusters—may surprise you! Some assume pirates wore eye patches there to cover a missing eye or an eye that was wounded in battle, but in fact, an eye patch was more likely to be used to condition the eye so the pirate could fight in the dark.
https://www.childrensmuseum.org/blog/why-did-some-pirates-wear-an-eye-patch
Privateer & Pirate Clothing - Hats. By far, as is the case today, one of the sailor's most distinctive garments is the hat. While many pictures and descriptions of sailors suggest a kerchief is placed over the head, this is historically inaccurate for the 16th and 17th century. Leather Skull Caps.
http://bbprivateer.ca/?q=book/export/html/7
The typical pirate outfit consisted of breeches or trousers, knitted caps, waistcoats, stockings, linen shirts and shoes. Pirate clothing, commonly referred to as slops, outfitted men on land and at sea.
https://www.reference.com/history/did-pirates-wear-ee70f4bc24aef0d4
Sailors tarred their outer clothing to protect themselves from the wet weather. They began to do this at least as early as 1631. Artisans, such as carpenters and joiners, also wore leather, canvas, or linen aprons to protect their clothes. Officers, of course, wore finer clothes than what their men wore.
http://www.cindyvallar.com/dress.html
The Elizabethan Sumptuary Laws therefore enforced what clothing individuals were allowed to own and wear, an easy and immediate way to identify rank and privilege. Pirate clothing, especially that of the successful and wealthy pirates took great delight in flouting the Elizabethan Sumptuary Laws.
http://www.elizabethan-era.org.uk/pirate-clothing.htm
Pirate Clothing - The clothes worn by a Pirate Captain. The typical clothes worn by a Pirate Captain are illustrated in a description of the clothing worn by Black Bart (Bartholomew Roberts). He was described as flamboyant dresser. His waistcoat and breeches were made of velvet in a rich crimson color.
http://www.elizabethan-era.org.uk/pirate-clothing.htm
The eye patch could be used to prepare one eye to see in the dark, so when they would go below deck they could swap over the eye patch from one eye to the other and see with the eye that has already adjusted to low light conditions. This would allow them to instantly in the dark.
https://www.childrensmuseum.org/blog/why-did-some-pirates-wear-an-eye-patch
This was no less true in other historical time periods, and it was true of pirates, who refused to live under the confining rules and regulations of society and government. They often wore the traditional garb of sailors, but acquired articles of clothing outside their station from captured cargo and innocent prisoners.
http://www.cindyvallar.com/dress.html
Adam Baldridge, a pirate turned merchant was a slopseller to the pirates at Madagascar, and received a shipment of clothes on 7 August 1693. The consignment included 44 paire of shoes and pump, six Dozen of worsted and threed stockens, three dozen of speckled shirts and Breaches, twelve hatts….
http://bbprivateer.ca/?q=book/export/html/7
what did pirates actually wear
Pirates wearing Breeches or trousers, knitted caps, waistcoats, stockings, linen shirts and shoes. Pirates actually wear breeches or trousers, knitted caps, waistcoats, stockings, linen shirts, and shoes.  