I worehad my suit and it was a bad surprise.

So, I should to buy a new one.

I have the hope to find an offero buy a new one before saturday.

But when I wore my suit and it was, I had a bad surprise.

Alternatively: "But when I put on my suit, I had a bad surprise."
Or maybe, "...I was in for a bad surprise..."

My suiIt does not fit me.

This sentence might be better as part of the last sentence: "But when I wore my suit, I was in for a bad surprise: it does not fit me."

We're still talking about the suit, so it's more natural to simply say "it".

Also, you can leave out the "me" and it will still be understood that it doesn't fit YOU. Example: "I tried to put it on, but it didn't fit."

So, I shoulneed to buy a new one.

or, "I should buy a new one."
Note that "should" does not use "to" the way "need" does. "Need to buy" versus "should buy".

I have the'm hopeing to find an offer before sSaturday.

Days of the week, like Saturday, are always capitalized in English. So are months and holidays.

This weekend, I am going to a wedding.

So, I should to buy a new one.

I have the hope tohat I will find an offer before sSaturday.