I had black Izod suit for cruise formal nights.
The pair of pants comes with the suit is very loose fit, so I had thought about getting a pair of slimmer fit pants to go with it.
I had also tried other Izod pants from Costco (good price but doesn't fit me well) and Haggard Garbadine (looser fit, though the color seems to match better).  Overall I am happy with this pair of pants.

pro -
fit (best fit among several pairs I had tried), 32x32 fits me nicely (5'10", 160lb) with room around the waist for potential growth.
low maintenance (machine washable, the pair comes with the suit requires dry cleaning)
strech (96% polyester, 4% spandex)

con -
UPF 15 (not 50 as mentioned in the description, though it may be irrelevant for my use)
price (relatively, Izod from Costco is only $16.50, Haggard Garbadine $20.xx)