alt Hacker Newsfvwm is still one of the default graphical environments in Slackware (even in -current), and fvwm95 came packaged for some time, too. Now fvwm95 is no longer part of the basic Slackware distribution but there's a SlackBuild for it:
https://slackbuilds.org/repository/15.0/desktop/fvwm95/
I like the Win95 aesthetic, but I like a close relative, KDE1, better; and I have configured my Plasma 6 setup along these lines. Screenshot: https://imgur.com/a/Q9Gfs08
Back into FVWM, Slackware also has a SlackBuild for the next-gen fvwm3. FVWM configurability could be amazing, although it can be a challenge.
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To each his own. I had a phase of emulating the classic W2K look, but like W95/98/ME all of this it feels too dark, dirty greyish for me now. Still in times of late KDE3 I then switched to https://store.kde.org/p/1100735/ but with different more colorful (soft pastel) icons which I can't remember the name of anymore, later then to https://en.wikipedia.org/wiki/Bluecurve , but not like the ugly default depicted there. It could be customized to a mix of that Reinhardt style and Microsofts 'dot.net' style, still using the forgotten soft pastel icons. Which would then be applied to apps for other toolkits as well. Very consistent. I like consistency.
Meanwhile, Plasmas Breeze (light) does all of that for me, again. One could maybe depart from the breeze window decorations, and exchange them for 'Klassy', they can 'fit', there is much to change, chose from. I'm trying them out at the moment. The thing with Breeze is, many other apps have presets for that also, like LibreOffice, which leads to even more visual consistency :-)
My desktop is blank, a mix between soft pastel yellow and 'manila' paper. No icons, widgets, clocks, weather. I don't care about CPU or Network speed there. I wouldn't see them anyway, since I tend to have windows maximized. If something would be wrong Kget or Ktorrent would make themselves known, which they won't ;-> CPU speeds suffice, even if mostly clocked down to 800Mhz :-)
My 'taskbar' is at the top, only 24px high. I switch between 3 by 3 virtual desktops by either using that too small (for that arrangement, it should grow a little when hovering the pointer over it) widget in the taskbar, or by jamming the mousepointer into one of the four corners, which makes that 'expose'-like thing appear.
To me, the big aesthetic of early Qt/KDE1 is "Obvious Motif ripoff". Aside from the Win95/Warp style titlebars, if you don't have the big thick bevels and the distinct scroll bars, it's not quite right.
It really galls me that they removed the Motif style in Qt6, since I target that as my default look and feel. It gives a nice "This is expensive professional software with a codebase tracing back to the Reagan administration" vibe.
There are themes that come close in various attempts-- "Commonality" for Qt6/Kvantum, and some of the assets from NsCDE for GTK, but it feels like a pitched battle against design teams that desperately want to mimick whatever Apple is doing this week.
https://imgur.com/a/MWiFhkH