I'm a native speaker, and I think there is not much different between 合适and 适合。
这件衣服很合适你and这件衣服很适合你are both right.
Even though 这件衣服很合适 has no problem in grammar, but I still think this sentence lost the object.
٢١ نوفمبر ٢٠١٤
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I think there is no difference like in 外国 and 国外。
But I'm not native speaker