Pilgrims are always portrayed as wearing bland, black clothing. That’s just because they wore black for special occasions, which is when most things are documented.
Black clothes were considered people’s nicest and best. Their portraits were taken in their best clothes, too. Everyday clothes were made of many colors. Brown, brick red, yellow and blue were common.
Other clothes were made of cloth that was not dyed. These clothes were gray or white, the natural color of the cloth. All kids wore the same thing- gowns.
Yes, in the 1600s, boys wore dresses until they were much older. In fact, the colors blue and pink didn’t become distinguished as masculine and feminine.
It came about for marketing purposes, actually. Up until then, boys and girls wore just about the same thing and pink was not a controversial color for boys. So, the pilgrims weren’t as bland as we thought they were.