Can anyone suggest where I can buy knickers for my husbands very elderly Gran? She is in her 90's and won't want anything frilly or brief. The ones she has now I have never seen in the shops and she cannot remember where she bought them. They are full briefs and made of quite a thick cotton and not at all like the ones I see in M&S etc. which are thinner. I have also looked online with no joy. Thanks in advance for any advice.