Seconding FickleFlame107's opinion; lanky types can look nice when skinny so long as the rest of them is well-maintained (i.e. good hygiene, nice clothes) and they don't look sickly.  One issue though is that these thin dudes from personal experience tend to dress poorly for their shape, cargo shorts and t-shirts droop off of them like they're on a hanger and it makes them look bad (really, if you're trying to look nice no man should be dressing like this anyways...). Well-fitting clothes make all the difference.