Open zippers can snag delicate clothing and scratch front-loading washer doors. Make sure they are up before starting the wash cycle. Unbuttoned fasteners can also pull fabrics or damage the drum if they come loose.
First, subtly dampen a part of the garment, then dry it with a white cloth to see if the dye stains. If so, wash the item only until the color stops fading. You can also include an old white sock in the wash to check.