Strapless bra (my boobs need all the help they can get whatever the weather!), knickers and a midi length loose cotton sundress from Roman. I have several similar dresses which have hardly been worn until now. On cooler days I wear cropped trousers with loose floaty tops, baggy t-shirts or strappy sun tops.
I'm sitting the the coolest room in our house right now, the living room. I'm only here because I can't get the broadband signal in the shadier part of the garden. Every door and window is open, there's a gentle breeze, and cool air is drifting through. The temperature is 30 in the house and 37 in the garden last time I looked.
As long as I don't have to go anywhere or be too active I'm quite enjoying having some 'proper' summer weather, though I know it will end sometime, probably at the end of the month when our son comes to stay, he always brings rain with him!