l looked for a jacket because I want to ited one.

"want to" is used with verbs, "want" on its own is used with nouns.

But I try itwhen I tried it on, it didn't look good on me.

"tried it" can be used for trying lots of different types of products, but for clothes, people normally use the phrased "tried it on" instead.

It can't be "try it" because that is present tense, and you're talking about something that already happened.

I think, if l were older l clould wear it at the time.

l felt toovery sad.

"too sad" is comparative to how sad you expected to feel. Like 嬉しすぎる。Very is more like とても here.

l look for a jaket because I want to it.

I looked at a jacket because I want to buy it.

But I try it, it didn't look good on me.

But I tried it on, and it didn't look good on me.

I think, if l were older l cloud wear it at the time.

I think if I were older, I could wear it at that time.

l felt too sad.

l was looking for a jacket because I want to itbuy one.

But when I tryied it, it didn't look good on me.

I think, if l were older l clould wear it at the time.

I went sGoing Shopping.

Usually, you don't put periods in titles.

lI looked for a jacket because I want to ited one.

ButWhen I try itied it (on), it didn't look good on me.

I think, if l were older, l think that I clould wear it at the timethen.

lI felt too sadextremely upset.

l look fored at a jacket because I want toed it.

This is how you would say this if you took a look at a specific jacket

But I tryied it, and it didn't look good on me.

I think, if l were older l clould wear it at the timepull it off.

I'm adding the phrase "pull it off", which is a casual way to say "wear something fashionable and make it look good".

l felt tooreally sad.

l looked for a jacket because I want to ited one.

But when I tryied it, it didn't look good on me.

I think, if l were older l clould wear it at the time.