When is it okay to lie?

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If someone asks a direct question I supposed one wants a honest answer, but it isn't that way is it? For example: a girlfriend asks me if she looks good in that clothe, I just MODERATE the answer but I saw that the clothe doesn't go with her when it doesn't. But people say we have to lie sometimes to not hurt someone's feelings, but I think I don't wanna see my girlfriend walking around wearing something that clearly doesn't go with her and people would stare and laugh... I don't think it would okay to lie also in another example: a girlfriend is clearly going to marry the guy but I know he isn't good enough for her not because I'm protective but because he looked at me in a flirty way... Even if I risk the friendship as she could take his side and actually marry him, I wouldn't lie. But I know people that would answer: He's the guy for you if asked directly, I would say he isn't and why... Is it really okay to lie? Even minimum lies, when it's fine to tell a lie? Plus: there are girls that get angry in hearing the truth.