If you haven't got Instagram then get it. There are hundreds of fantastically stylish women of 50 or 60 plus on Insta that are absolutely brilliant for fashion inspiration. Admittedly many of them are clearly ex-models, super slim with amazing bone structures and beautiful faces and I assume very healthy clothes budgets judging by their houses in the background, but plenty who are just the attractive side of ordinary and styling more accessible high street fashion too. Some are more 'normal' sized as well. Obviously Insta is also choc-full of 'body positive' overweight women twirling in clothes, so something for everyone regardless of age, shape or size.
I'd say start by identifying which basic shapes flatter you and make you feel confident and comfortable but also DO push yourself out of your comfort zone a little bit, to avoid staying in a dated rut. For example try wide leg or flared jeans and some really nice trainers rather than straight legged jeans and boring black ankle boots with a mid height heel. My BFF was recently complaining after losing weight that she was struggling to feel like she looked fashionable in anything, in spite of her weight loss, but she is still stubbornly wedded to shapes that are at least 5 or 10 years behind the times. It takes a leap of faith to try something new when you are over 50 because we are frightened of looking like mutton dressed as lamb, or we just don't feel like ourselves in something different, so start small with a couple of changes to your usual 'go-to' shapes. Don't frighten yourself by doing it all at once.
I tend to avoid florals and big patterns now. I love them but I have accepted that it's hard to wear the flowery, colourful dresses I used to love without looking like a pantomime dame.
Invest some time in finding out which colours really suit you, and learn how to layer and style things in a current way. For example at the moment it's the thing to tuck in shirts at the front but not the back and to layer shorter jumpers or waistcoats over the top.
Build yourself a capsule wardrobe one season at a time, with five or six basics in a coordinating colour palette that all work well together. For example, I am sixty and this autumn so far I have been wearing two pairs of trousers I live in, both M&S. Wide legged dark denim jeans and some cream wide legged chino type trousers, some lovely smart trainers in an interesting colour (New Balance 327s) a couple of burgundy tops, a couple of dark olive green tops, a couple of simple, versatile cardigans in olive green and taupe. Also a chunky, camel coloured, woolly gilet (NOT the polyester quilted middle-aged stalwart but something more current and interesting like bouclé, astrakan or faux fur) which I live in and looks great over everything. then some basic black or charcoal base layers and everything I pick up works together in any order. I also have one nice wintery dress in a subtle animal print and a taupe coloured corduoroy A line skirt and some knee high slouchy suede boots, which also look great with the woolly gilet.
Accessorise with one or two bits of statement jewellery or a nice eye-catching bag in an interesting colour, or a bright oversized scarf, but don't tie it in a dated way.
Get your hair cut in a style that is low maintenance and isn't instantly dating or helmet like. If it's currently in a style which you see in at least 50% of the women your age then it's probably terrible and very dated, or at least not doing anything to enhance how you look.
Apart from the boots and trainers, nothing I've bought has cost more than £45 per item.