(left to right) Quakers and Protestants, in their normal clothes.
The Dutch, Puritans and many other religions, such as Protestants (which include Quakers, Baptists, Puritans, and Anglicans), English, German Lutherans, French, Jews, Swedes, and many people who wanted to escape from persecution. Many people came from England, if they were settlers, or if they were slaves, they were imported from Africa. In the Middle Colonies, there is a lot of wealth but also a lot of poverty. If they can afford it, the people wear extravagant clothing to show that they are wealthy. If you are poor, or are a Quaker, you wear plain clothes. Quakers believed more in being in tune with the spirit than looking wealthy.
Why did they come?
People wanted to come to America for multiple reasons. A few were they wanted great ethnic and religious diversities. Many Puritans and other religious groups wanted to escape persecution and came for religious freedom. Some people were brought to the colonies by patroons. Many slaves were captured and brought involuntarily here for work. Some came because they were banished for being dissenters, which wasn't supported in some of the other colonies.
The Middle Colonies consist of New York, New Jersey, Pennsylvania, and Delaware. The winters were mild and the soil was rich: great for farming and other agricultural stuff. They settled all along the East Coast, starting right above the Spanish territory (which is now Florida), all the way up to Maine. New Amsterdam was later created. It was built to defend the Dutch West India Company, which was a fur company in the Middle Colonies.
They had a ton of shipping and commerce. They traded furs, hunted, and fished often. There were cattle, grain, and tobacco being grown in the Middle Colonies. They had longer growing seasons and very rich soil. They also grew fruits, vegetables, and other common cash crops. The city was quite wealthy because of the crops. The Middle Colonies did not depend on slavery like the other colonists did. But there were some slaves, and they mostly lived in the city.
As explained in 'Who Came?', the Dutch, Protestants, German Lutherans, English, French, Swedes, Jews, escapees from persecution, and many others came. They also had governors, noblemen, proprietors, landlords, and the DWIC (Dutch West India Company). They created a treaty with the Indians explaining that they would not harm each other. It also explained that if anyone, not those two groups of people, attacked them, then they would protect them, and vice-versa.