Above are a series of the same dress designed for an American Girl size doll. The first picture is of just the basic dress, simple in construction, no sleeves and snaps up the back. A very plain dress.
The next few pictures take you from adding a simple stripe (no repeat of the pattern), to a double repeat at the bottom of the dress, where the repeat is the skirt of the dress and finally the entire dress. As you can see, from this simple addition of color (s) and using the same pattern in differing number of repeats you can get many looks from just one simple dress.
The last dress looks more complicated than the rest, but it is still the same dress, but with a different color sequence.