Well....in the 50's and 60's, showers were something you had at School, after rugger and PE. I can't recall any of my friends having showers in their homes, as we didn't in mine. I use a shower when I am staying I my caravan, and I sometimes use shower gel then, but just as often as I use soap. At home I have a bath and use soap.
( does anyone remember soap-on-a-rope ! )
T-Shirts been around for all of my life and that is now 63 years, plus 3 days !
Not sure about gravy granules. My Mum always used Bisto and gravy browning. I make gravy very rarely these days, but when I do I use granules.