Referees should buy the new style, as the old style will be phased out.
The primary uniform still includes the yellow shirt with black stripes, and the alternate colors are : green, black, red and blue.
It is approved and expected that a mixture of old and new styles will be used over the next few years. As before, all three members of a 3-referee crew should wear the same color; however they will not be expected to wear all the same style.