I live in south Florida and it is still in the low 80's. Our quilt guild meets in the a.m. and most members are retired (some however are young - under 50). We dress for comfort - mostly capri pants, tee shirts, sandals or sneakers; on cool mornings - jeans or other long pant material, tee shirts, sweater and sneakers. We are very casual here. We just go for the fun.
Cherie