Firstly, Happy New Year! I hope that he replies here were helpful. I'd reiterate much of the above and in response to the heading; that my partner does indeed wear stockings and suspenders through the week. She has tried several types of Hold Ups, but there have been a few memorable Hold Up falling down moments! Not usually what women want!
She gets stockings online from Gio Stockings, What Katie Did, Mayfair Stockings, Nylon Dreamz , Levante, Secrets In Lace, etc, tights from MnS, Snag, Pretty Polly and brands from TK Maxx.
With stockings, my partner likes the security and comfort from a really good deep suspender: modern open bottom or pantie girdle and Corselettes are excellent and aesthetically really lovely. With 4 or 6 metal clips your stockings are never falling down!
Good advice can be had from the What Katie Did website. She has videos on the wearing of different types of suspenders and hosiery covering everything from exquisite Fully Fashioned Stockings to tights.
A good shop to browse
https://www.sandras-online.co.uk/collections/girdles
Kiss me deadly have good advice on practical matters....
https://www.kissmedeadly.co.uk/blogs/news/indelicate-questions-about-delicates
Also, Stockingshq have a product Forum and a general discussion forum where you can ask questions of others, they provide excellent discussions on all aspects of wearing. Be warned some of the other forums on users topics are a bit risqué.
https://forum.stockingshq.com/index.php?/topic/63400-suspenders-advice-please/