Classic grey-toned flannels with the unmistakable 'fuzzy' appearance.
Pure wool flannels are autumn/winter fabrics with heavier weights. In other words, they are not applicable to Singaporean weather.
Jazz things up with a houndstooth number.
These babies are only about 9 oz, which is around the same weight as your typical spring/summer fine worsteds. Sounds contradictory, but consider them your tropical flannels. You get the best of both worlds with these gorgeous cloths - amazing drape with maximum comfort.
Besides that incredible hand-feel, flannels have that signature 'fuzzy' appearance that no other cloths can duplicate. Now, how many of the dudes in your office rock flannel trousers at work? If you're looking to stand out from the crowd, this is the kind of attention to details that men should strive for - a uniqueness in their choice of fabrics. Floral collar inlays and fancy colored buttons are like MC Hammer - they've had their days in the sun, but let's move on now.
Heftier alternatives are available too (~16 oz) if you're a globetrotter.