シワがつかないようハンガーにかけてって英語でなんて言うの？

All of these explain that you want your shirt (or any other item of clothing e.g. skirt, dress, top, trousers) to be hung up on a hanger so that they do not get creased. To crease means to get wrinkled. It is common to say 'please' because it is polite to say this to someone who is working for you - so in this case, washing your clothes and hanging them up after. To hang up, means to put the item of clothing onto a clothes hanger to prevent the creases.

It is important to always express your request with the word "please" to be polite. "Please hang my clothing, so they do not wrinkle." when you say hang it is understood that you want them on a wooden or plastic hanger. To be very specific you could say, "Please place my clothing on hangers." (Place meaning to put them on or to hang them." "Will you please put my clothing on hangers to avoid wrinkles." Avoid - to keep something from happening. Here you are trying to avoid wrinkles, by not folding the items, but by hanging them.

This is very common and hotel staff should be used to hearing this request. It is always polite to ask or tell the staff that you would prefer your clothes to not have wrinkles or creases. If you want to be specific you can request that they not fold the article of clothing, rather hang it on a hanger. I would prefer that the shirts be hung, so they don't get wrinkles. Could you please use a hanger for the items? I would like to avoid creases in my clothes. Of course you can always start with preference: I prefer that the shirt be put on a hanger rather than folded to avoid creases. I would prefer to avoid wrinkles, so please use a hanger rather than folding the shirt.

This is a very polite way to ask because you use the word "please" to give a clear command, and explain why. The staff should easily understand what you would like. I hope that this helps! :)

Any of these sentences will work; however, in the first and third sentences, a contrast is used between hanging and folding the garment. It isn't always necessary to explain why you want something done, so even a simple, "Please hang it up" may suffice. However, if you wish to explain your reasons, then saying things like "I don't want to see creases or wrinkles" will let your listener know why you are asking and may help them to remember your request.