I still have a few doubts. Thank you very much.

1) When I go to a party, I generally wear clothes which are smarter than the ones I wear for school.
2) I want to be original and on fashion (is it possible?)
3) What do you think of/about this coat? Are both "about " and "of" possible?
4) I think it is very important to be comfortable because I have to spend a lot of time at school. In the other cases I think it's more important to look cool because I really like being on fashion (wearing fashionable clothes/are both possible??)

1) OK


2) I want to be both original and in style.

3) What do you think of/about this coat? Are both "about " and "of" possible? <~~yes

4) I think it is very important to be comfortable because I have to spend a lot of time at school. At other times, I think it's more important to look cool because I really like being in style.

PS -

You can say that a particular jacket or shirt (or any other article of clothing) is "in fashion" but people are not in fashion!! And "on fashion" is never used.

And if you think "in style" is too cumbersome, then just say "it's more important to look cool / to be hip / to be in.

1) It is common for people to dress differently for different occasions, such as wearing smarter clothes for a party compared to what they wear for school. This allows individuals to align their attire with the atmosphere and expectations of the event. If you would like to explore more options for dressing up for a party, you can try looking for fashion inspirations online, such as fashion blogs or websites. These platforms often provide tips and ideas on how to dress for specific occasions, including parties.

2) Being original and on-trend at the same time is indeed possible. Achieving this can involve a combination of personal style and incorporating current fashion trends. To stay updated on current fashion trends, you can follow fashion influencers or subscribe to fashion magazines. Additionally, you can explore fashion websites or visit stores to see the latest collections and trends. Keeping an eye on social media platforms, such as Instagram or Pinterest, can also provide inspiration and help you stay in touch with the latest fashion trends.

3) Both "about" and "of" are possible when asking for someone's opinion about an item of clothing like a coat. For example, you can ask, "What do you think about this coat?" or "What do you think of this coat?" Both phrases are commonly used and convey the same meaning. It's a matter of personal preference which one to use.

4) Both "wearing fashionable clothes" and "wearing fashionable clothes" are grammatically correct. Additionally, both "important to look cool" and "important to be comfortable" convey your preferences for different situations accurately. It's a matter of personal values and priorities. If you value comfort more in a certain setting, such as at school, it is important to prioritize being comfortable. If you prioritize looking cool in other cases, you can focus on wearing fashionable clothes and staying updated on fashion trends. Ultimately, it's important to find a balance that suits your personal style and makes you feel confident and comfortable in different situations.