They're the same white wedding dresses all other brides wear, except that Orthodox Jewish brides only wear dresses that completely cover them up.
White.
Orthodox Jewish brides don't because of the laws of modesty, but the other branches allow it.
Yes, you will find Jewish brides wearing different colour wedding dresses just like brides from any other culture.
To symbolise purity.
They may, but they usually don't. They wear gorgeous and colorful dress on marriage.
Yes, but in other countries, they wear colorful costumes. There is no religious Jewish Law about what a bride must wear and so a Jewish bride will typically wear the colors that a bride wears in the general area of heritage. Western Jews usually wear white. Yemenite Jews wear a myriad of colors and are bedecked from head to foot in jewels. Some Indian Jews wear red, etc.
Not always. There are some pictures of wedding dresses that are, well.. you could say very showy.
they wear red blue and white dresses and blue jeans
Some wedding dresses have high necks, and maybe some brides feel that even a pearl necklace isn't "necessary".
Men wear suits and ties, and women wear dresses or slacks.
Orthodox Jewish brides don't wear two veils. The veil just has to be able to cover her face and hair during the ceremony, the same as most traditional wedding veils. Some Orthodox brides do wear a veil that's more opaque than normal though.