NOS88

Looking for some help here. As I indicated in an earlier post this week, I've just recently started to commute by bike again. The first five trips in and out of work have been encouraging. However, I'm having some issues with keeping my pants free of chain crud. I'm using a leg band to keep the pants away from the chain; yet on two days I've still ended up with chain marks. I did a quick Internet search to see if I could get a chain guard to put on my Cannondale 800T. What I came up with was SKS has one that will work with a chain ring as large as 46T. I'm currently running a 50x48X24 triple. Hence, I suspect it won't work. Any thoughts about other options? (BTW, wearing cycling specific clothes won't work. I'm expected to walk through the front door already meeting the dress code - casual professional).