Wedding event advice?

My Cousin's Wedding is coming up CLOSE and I'd like to Look Nice and feel Great!
All I have are Mostly Jeans and Nice Blouses and T-shirts and Shoes. I do own a Couple of Nice Feoni Dressy Heel shoes too and a Couple Dresses (that I never wear).

Which...

would be more Appropriate? Jeans and a blouse 0R a nice Dress?
I Nevver ever dress up in dresses cause I feel naked and feel I am being watched.

BUT what have you Girls Wore at Weddings??

My Idea is a nice pair of Jeans, Pretty Blouse and Heels. What do you think?
Or should it be a pretty dress and heels? I'll Wear whatever gets the Most Votes if it sounds good.

Also, What are some Great Gifts to give that are inexpensive but LOOK Expensive??
What do you Guarantee that they'd like? What Gifts have you Received at Your Wedding or Gave to others?

Thanks so much for your Help and Please Answer!!

it depends what ind of wedding it is, what kind of relationship you have with the bride and grooms, and if you're going to be in the pictures (I can tell you now, most brides want it to look like they're guests have put some effort in, and jeans rarely convey that!)

wear a dress, if you've never worn them, now will be the perfect oppertunity!

Wear a dress. It is never acceptable to wear jeans to a wedding (unless the bride requests it). As for a gift, find out where they are registered and pick something off that list.

Thanks! I'll Wear a Stunning Dress!

I did wore jeans to one wedding last year, No one seemed to care. But my Cousin Might!

Thanks again!!