Weddingbee boards

Hey all!  I feel silly for not knowing the answer to this already but I have a question concerning grooms/men attire that I need your help with.  Our wedding is set for September of this year and I'm hoping to find light-weight, roll up sleeve shirts for our guys.  They won't be wearing jackets, just the shirt and a vest.  The ceremony is outside and there will be a massive bonfire later that night so I wanted to make sure the fabric is something that the guys will be comfortable in and won't pass out from heat stroke.  I really have no idea what to look for!  Thanks in advance!