What do these Golden and the Silver Pantaloons really do to your character???
Do you get some kind of Bonus or Bonuses???
If so, what are they?

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If you have golden, silver and bronze pantaloons they can be made into an armor called Big Metal Unit and a bazooka if you take them to Chromwell...

they are necesary to make a giant armour(makes you a adimite golem) with a very low ac(some other benefits to i think)

cespenar i think. i'm pretty sure the last piece is in tob

Yeah you have to bring the first part from BG I, second part from BG II and last part from ToB... there is a site dealing with this issue, I'll try and find it right away...

Here it is::

Play with a big metal unit...
[Mar 08] One of the most elusive Easter Eggs in the Baldur's Gate series has been exposed by the fine folks at Planet Baldur's Gate--the Big Metal Unit. They've posted a nice walkthrough of the entire process, so check it out!

http://www.planetbaldursgate.com/bg2/walkthrough/bmu/

dude I think Baldurdash has the info on this - it's actually the biggest game easter egg ever (probably) -

Yeah it's pretty big, but I also think it spoils a bit of the fun with that thing, it is funny enough getting it but I wouldn't recommend using it...
Is there any other easter eggs in BG????

i used it some but you can't go through doors which made it almost useless in my opinion. Well not useless but annoying as all hell. you have to take it off, scout to see if any guys are in the room if not walk through, if so well actually scout before you take it off cause you cant switch armor in battle

Re any other easter eggs -

I think there's a bunch, like the Elvis poster, the Blair Witch parody, etc... I liked them all.

Try eggheaven2000.com or eeggs.com