Singapore Expats

I am going to be traveling to Siem Reap soon and need long pants and long-sleeved shirts to cover my arms and legs, in an effort to keep the mosquitoes off (I can't take anti-malarials or use DEET at the moment)....

does anybody know where I can buy clothing that will cover me, but that will also be relatively comfortable in the heat?? I have no idea where to go...
thank you!!!

where would you go to buy clothes in your home country?

I'd try jcpenny.com.sg. I found some good bargains on there last time I needed to purchase clothing.