Maybe you're thinking of special attachments for shirt tails to the interior of trousers...? Your question reminded me of a story my father told me about a friend in university who had Borrelli make shirts (and trousers?) so that they could be attached, by buttons, as I recall, to the inside of his trousers. When I asked why in the hell he bothered, my father, in typical understatement, said he was suitably rotund that they were necessary..... and added that they worked very well. I would think that this is a better option than running something all the way down to one's socks, no? Maybe Borrelli can still do this.... anyone? Or, if it's the socks you're concerned with, why not try the above suggested sock garters. Or longer, elasticized socks... ?