Wow! Contrasting colors. Without actually seeing the blazer it kinda hard to make a good recommendation. I would move towards complementary colours such as khaki or brown.
What do you mean by "brown/gold blazer"? Are you talking about a solid-gold-colored blazer, like the Century 21 realtor jackets? Or are you talking about a sportcoat with a significant golden brown color, but with other colors are well?
That would certainly work with the orange or purple.
If you're talking more like the color often called "camel," then brown (really brown, i.e. darker than the jacket) or dark blue. If it's a patterned tweed or something, you can probably wear it with lots of colors, including khaki.
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