"双排扣水手上衣" can be translated as "double-breasted sailor blouse" or "double-breasted sailor jacket" depending on the context and the specific style of the garment.
"Double-breasted" refers to the style of the front closure with overlapping flaps and two parallel columns of buttons.
"Sailor blouse" or "sailor jacket" conveys the nautical or maritime-inspired design typically associated with sailor uniforms.
For a more formal or specific term, especially in fashion contexts, you might also encounter "double-breasted navy-style blouse" or similar variations, though "sailor" is more directly indicative of the water-themed origin.