In my case, as a 53 man, I used the secondhand clothes stores that there’re not a few here and there. Once I bought some from T-shirts, jacket, until clothes for date and I’ve worn them over 10 - 20 years. When it comes to underwear, I purchase them at 100-yen shops that also there are not a few around here and there. I can’t live in Japan without the two. Besides, I go to the ‘Shimamura’ that なみ san wrote above.

By the way, my shoe size is very short and I buy always ‘22 - 24 cm socks, but I use them also over 5 - 8 years until they have a hole.