wetsuits are too hot in WA summer and the idea you had about the rashie is a good one... For sun protection i wear a pair or lycra running tights like the footy guys wear at training... these are great for sun protection and on the days that i wear my knee brace it also stops blisters from rubbing...
Rebel sport is where you can get them... they have an online store, pay with visa and get them home delivered...

just had 3 skin cancers removed last week this is why i worry about sun protection... i am only 31 and had my first one removed at 28... so now i keep covered and white all summer!!
happy windy days
Pos