I need to correct your English first.

Hello everyone! Please help me to improve my jokes translation.

A Man from Guangxi province.

An old man came into a clothing store, for and asked the seller, said:
"I need two suits" Sell me two garments. All dialog must be enclosed in ""

The seller says:
"Old man! Why do you need want to buy two? This is a good piece of clothing Our clothing is very durable. You look like you are  are very old, about eighty years old.  This piece of clothing enough to end your life It will out last you!" 

- Since "The first pieces of clothing one is for me and the second thing is for my dad!"

"Your father? If you're eighty years old, then your father probably he must be about a hundred years old!"

"True Right. We need to look elegant for my grandfather's wedding."

"Do "ou have a grandfather? ! In this case, Then he must be one hundred and twenty years old!"

- Right. "Sure is!"

"And he wants to get married!!!" ? !

"Nope. Just a shortgun marriage from his parents."  He will not, but his parents forced him to.

I am not going to do a direct translation, otherwise the joke is lost.  So I am doing it by meaning.  I am going to present my version and you can compare. 

一名男子从广西省。 

广西男汉

一名老男子来到一家服装店，对出卖人说：出卖人 can also mean a "traitor"

一个老头子進了一间绸莊, 对推銷员說

- 卖我两件服装。

我要兩套衣服
出卖人说：

推銷员说
- 老伯伯，为什么你要买两件吗？这件服装很好。你很老，大概八十岁。这一件服装足够到你的生命的尽头。

老伯, 看你有八十上下, 咱们的材料非常好, 一套你就一生用不尽啊 Chinese will avoid using the word "death" in conversation unless it is for swearing.

- 因为第一件服装为我和第二件为我爸爸！

你误会啦, [第一套是給我的, 第二套是給爸爸享用的
- 你爸爸吗？如果你八十岁，那么你的父亲可能大概一百岁！

咹, 是嗎? 如果你是八＋左右, 父亲应该有一百岁了!
- 对了。 我们需要看起来优雅为我爷爷的婚礼。

嗯, 我们要在爷爷行婚礼要看得 /棒/標致而时髦/了不起/
- 你有爷爷吗？！在这种情况下他必须一百二十岁！

嘩! 爷爷肯定有一百二＋岁了!
- 对了。

是啊!
- 而且他要结婚吗？！

还要結婚!
- 他不要，但他父母逼他。 

錯了! 是他父母逼他的.

Another good one!