Non-iron shirts
I have looked in a dictionary, but I cannot find how to talk about non-iron shirts in Chinese. What phrase can I use to describe a shirt that doesn't have to be ironed because it is resistant to wrinkles?

Question

Answer

免烫衬衫
通常“免＋xx”能表示不需要或不必的意思
Usually 免＋xx means that you don't need to do something 
例如：
For example:
免费：不需要交费 free
免考：不需要考试 don't need to take an exam
免票：不需要门票 don't need to buy tickets
但不是所有词汇都能这样搭配
But not every words can be used like this way
例如：免走 don't need to go 
我们不这样说
We don't say like this
希望能帮到你
Hope that I can help you

Answer

if I translate directly in Chinese.    “没有熨过的衣服”   I can't give you a short answer ,sorry.

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You could use the word 免熨烫(mian3yun4tang4).There are many words and phrases with the word 免mian3 in Chinese,such as 免洗(mian3xi3),免费(mian3fei4),免税(mian3shui4) which mean disposable(no need to wash),free(no need to pay) and free tax.

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无需熨烫的衬衫或者免熨烫衬衫。
恩。。。我并不专业。。。

Answer

Sorry.     It means "不熨烫的衣服”