Repetition:

An Object or Shape repeated over and over and is mostly the same (very little variation)

Pattern: is a combination of 2 or more art elements repeated in a recurring arrangement.  Lines, Shapes and Colors together create a Pattern

(Think of a patchwork quilt)

Repetition vs Pattern

Clothing

Repetition: Stripes are one element (lines) repeating 

Pattern: different elements of shapes, colors, etc. 

Famous Patterns/Repetition