I used to have the problem you have my lovely mum was always smart but she had to rely on me towards the end but saying that she never complained about the clothes she wore. So I concentrated on buying clothes that were suitable for all concerned and comfortable. She never liked polyester she told me it made her sore! So the shops I bought from included M & Co, liked Peacocks and Bon Marche, I stopped looking in M&S and discovered other shops such as ASDA and Sainsburys. I was like Hair Twiddler is now with mum's clothes.
I have washing on the line as I write, not for mum but for Dad he has mixed dementia and I find because of his relaxed attitude and thinking about what he has worn in the past, he is so much easier to pick clothes for and that are easy maintenance. He looks good too today in trousers bought from ASDA I haven't even needed to have them pressed.
I do have a tumble dryer but have always preferred line drying. I have left clothes out overnight to catch the morning sun and bring in for 11.00 ish beautifully thick and almost ready to wear if you know what I mean. (I used to feel embarassed doing this and laughed with my neighbour about it and guess what we all regularly do it now. It seems I think to others that we must be lazy, slovenly, that really is not the case. I just prefer the thick, comfortable, feel and look of the clothes when they come in dry from the line.)
My mum was nearly 79 when she died and she loved a range of clothes. I remember her favourite one, (I know this because she would smile when if appeared for her to wear following being washed. She always said "Oh, is it new? Just delighted everytime.) was purchased from NEXT of all places, whilst shopping for my young son.
I now have a stock of rotating clothes but always keep my eye open for instance I was in Aldi and have discovered some marvellous socks for dad they're very washable I turn them inside out and wash on 40 (not 30) and they are like new. I bought cotton jumpers for dad from Asda they are absolutely perfect, don't shrink or bobble or look thin.
I used to think that a certain shop was the only place to buy underwear, blouses, shirts and generally clothes, but that is simply not true their quality is not superior as I 'm sure you have noticed. I hope you have found my ramble helpful. All the best everyone.