I am looking to make a POLO cake this week, but I am not sure how I go about constructing the collar using fondant. I bought a 10 x 2 square pan for the foundation, it's just the collar I am not to sure about. Help please  

I haven't tried this myself, however I saw a photo where saran plastic wrap was wound up into a thick rope and curled into a semi circle, then the fondant collar was put over it and shaped for drying.  Can't remember where it was on the internet or I'd send you there for a look.

here's one thought--

scroll to the third picture down

http://www.eleganceandelephants.com/2012/11/knock-it-off-little-kids-grow.html

Thanks. I have seen that one... still looking around for more ideas. I did save that image though.

These may be of help:  http://cakecentral.com/a/how-to-make-a-knitted-sweater-cake-with-collar-and-bow

http://www.pinterest.com/pin/408912841138219507/

I realize this is a bit different kind of collar but am happy to explain how I did this one:

https://www.facebook.com/photo.php?fbid=527110640669500&set=pb.207874222593145.-2207520000.1392147577.&type=3&theater

I used a mix of gumpaste fondant so it would hold shape.

I looked around the kitchen until I found something the right size.  For me, it ended up being a small container of fondant.  I wrapped the fondant around the side and brought in front and placed it exactly how I wanted it to look.  

Here's an exceptional tutorial at a VERY reasonable price: https://www.facebook.com/theroyalbakery/app_251458316228

(Click Royal Bakery Tutorials)

I have it and LOVE it.

Here's another tutorial...it's for a dress shirt, but you may find the way they pieced the cake together helpful...I'm not sure: https://www.facebook.com/photo.php?fbid=495908508976&set=a.495906293976.254758.116951188976&type=3&theater

(you have to click several pics before to see, there's 6 total)