I realised that the way we dressed for summer was rather old-fashioned, in the 1980s. We rarely wore T-shirts without a collar (are they called T-shirts if they have a collar?), indeed my brother mostly wore buttoned short-sleeved shirts in the summer, and knee-length shorts. When I once sent in for a promotional "Shreddies" T-shirt from the cereal packet, I was hugely excited to wear it, because it was a proper T-shirt. My dad almost never wore shorts, being a child of the 50s who had to wear them a lot.
We also rarely wore sandals, even in summer, or on holiday: we'd all be in trainers and ankle socks. (We mostly holidayed in England or France; my parents didn't like hot places.) My brother once asked for sandals: mum bought him some very sensible beige leather ones, which he wore with socks, but we didn't know this was fashion crime. It wouldn't occur to us to wear flip flops - I didn't even know they were called that until I was a teenager. As a teenager I rebelled by wearing trainers without socks in warm weather, but I didn't wear sandals at all until my late twenties, because it simply didn't occur to me.