I'll chime in here to say that I was unimpressed with their tie selection. They didn't seem substantially different from the ones you can get for 99 Baht at Chatachuk. I recommend the Jim Thompson store for ties. If you want the latest and greatest JT Ties you can either go to the JT house store, or to the store at Siam Paragon. Or - if you're cheap like me - on the day you visit Jesse and Victor, keep riding the BTS all the way to the end of the Sukhumvit line, walk about another 10 Sois, make a left and go to the Jim Thompson factory outlet store. I got a tie there that I liked better than any one in the stores, and I only paid 600B for it, rather than the 1800 or whatever they wanted at Siam Paragon.

Locations to all of these stores are on the Jim Thompson website - and DON'T believe anyone who tells you while you are walking there that "Jim Thompson is closed today" - They're lying. If you go to the store during the hours listed on the website, they're open.