By Andrew Gould The Brooklyn Nets suffered a devastating blow to their playoff livelihoods Saturday night, going down 3-0 following a 109-103 loss to the Boston Celtics. It was a solemn evening at the Barclays Center, which made Ben Simmons’ attire stand out even more. Although yet to make his team debut, the 25-year-old drew attention for wearing a colorful outfit courtside. Amid a sea of players and staffers sporting Brooklyn’s black and white colors, Simmons donned bright orange pants with orange shades — playoff basketball is still played indoors — and a multi-colored jacket. Twitter users…