What is the correct way to write:

Her dress has nice features, like: its black, long and is made by Givenchi.

You should take out like and just put

Her dress has nice features; it is black, long and is made by Givenchi.

Lynne, I would write "Her lovely Givenchi dress is long and black."

Another possibility would be "Her nice, long, black dress is made by Givenchi."