Fashion has been dictated by cultural mores and constraints over the decades.  For a whirlwind capsule see http://www.fsgtaki.com/Brief-History-of-Fashion.html   It wasn't until recent memory (the '50s) that pantyhose, were introduced.  No more garter belts required.  In the '50s and early '60s, one didn't wear white after Labor Day and certainly, pants were not even envisioned in business and public as an accepted staple of a women's wardrobe outside of Hollywood.  Hats and gloves were part of the ensemble, and shoes matched the handbag.    Lauren Bacall was a trendsetter ahead of her time.  https://www.thecut.com/2014/08/lauren-bacall-knew-a-thing-or-two-about-style.html  Fur coats were relished and animals died so that women were stylish, but no more.  https://www.wsj.com/articles/the-awkward-heirloom-no-one-wants-grandmas-fur-coat-11580121002 

Flash forward to 2020.   Our societal norms, mores and constraints are more forgiving than ever.  A woman is free to select clothing that she prefers to wear and to embrace fashion, or just choose clothing that is a personal preference with no regard to trends.  Notwithstanding the influence of designers, models, social media and influencers, fashion is now truly a personal lifestyle choice.  Sustainability is in in response to global warming concerns.   https://www.worldcat.org/title/fashion-sustainability-design-for-change/oclc/894728850?referer=di&ht=edition  

While some styles are not appropriate for senior women, in general these women may choose to remain a fashionista or upgrade their wardrobe to be more au courant, giving a more youthful look to her persona and to reflect fashion trends.  There's nothing more appealing than a senior woman who has chosen to remain in style, choosing garments that suit her.  Witness Judy Dench, at 85, who independently sets her personal style without repudiation.   https://www.nytimes.com/2017/09/21/style/dame-judi-dench.html 

It is fairly easy to upgrade your wardrobe through consignment stores, local Goodwill and other donation resale outlets, eBay, online personal styling sites, and online consignment sites.  Take a moment to learn current trends.  Strive to look your best without spending a a Million.  It is your time now to dress for your own success as a senior woman with je ne sais quoi.   https://www.whowhatwear.com/anna-wintour-style-over-60 

For more fashion inspiration, see www.therealreal.com blog posts at:  https://realstyle.therealreal.com/