1. I don't think so either. 我也觉得不好。
I don't like them either.
I really don't think they look good.

2. That blouse is absolutely wonderful on you. 你穿这件衬衣很好看。表达衣服合适或者不合适的说法：
That shirt looks great.
They don't really fit you right.
I really don't think they look good.

3. That would be a good idea. 表示赞同选择
That would be wise.