I know its gotten a bad rap lately, but my aunts used to use a little talc for chub rub. Thinking cornstarch might help too.
I like seersucker, but it may not be professinal enough for your work place. I have found something called corded cotton. It is 100% cotton and quite thin but still opaque. The warp is regularly spaced with a thicker/stronger strand ie the cord. Quite comfortable, to me. 100% linen creases too badly for me but I do like linen/ cotton blend or either fiber with a little polyester or Lycra. Also all year round I love love love cotton/silk blend. Can be a little pricey. Back to the addition of a little poly, for summer I make sure the percentage of poly is around 10%. I dont have an issue with poly but if you do this isnt a good solution. I have some really thin rayons that are good in hot weather. I use them in trouser style fabrics becuase I think the fabric looks better in the fuller leg. Sorry no links because we are on opposite sides of the pond. US sources probably wouldnt help you.