An item of clothing for the younger or very fit man. I think you might need a stomach like any ironing board to carry a popover off well.

Hunted down this old Gant seersucker last spring, been wearing it a lot lately. Couldn't have done so two summers ago, before the bicycle routine.

I covet the seersucker po.  The Hawaiian brand Reyn Spooner had one that looked nice but is not offered now.   Billowy and forgiving.

There was a pullover/popover wrangle over on The Wardrobe all those years ago, with JFM (it was he, wasn't it?) preferring the name/term 'pullover'.  Now, to the snotty schoolboys of my generation, a pullover was some bobbling, pilling piece of crap your Mam made you wear in the colder weather, often mustard or brick red (I am going back the better part of sixty years).  'Popover was, I think, very much a John Simons term.  I'd see a 'pullover' as knitwear really - and rather unattractive knitwear at that - but the 'popover' as a cotton, lightweight item: maybe sea island at its very best? 
They were getting a fine old dissing on here recently.  I can't say I'd rush to buy another.

Interesting that the Shetland crew neck has assumed more or less cult status in Ivy League inner circles while the more humble lambswool is probably regarded as a ho-hum option.  And yet good quality lambswool - UK-made M&S for instance - is not to be sneezed at.  Our East Coast American friends might well agree.  And before Kingy begins telling me that English and Scottish products need no endorsement from Johnny Yank I'm only echoing something of what Horace (now absent) said some years ago.  To my eyes (weakening daily) the Boom Years offerings from Cable Car/Kirk look a bit M&S-ish.

I've got a blue brooks pullover shirt which buttons almost all the way through. Bit of a weird shirt, and when tucked in basically a normal shirt. Must have been a bespoke shirt, as it has a sort of half pleat. Slightly bizarre but I quite like the quirkiness of it, nonetheless

Shetland was often ‘some bobbling, pilling piece of crap’ from British Home Stores and cheaper than lambs wool.

Harrington in Guildford and I think possibly The Ivy Shop Windsor didn't stock Shetland sweaters back in the early 80's. All of their knitwear was either English made Alan Paine and various Scottish knitwear made in Hawick was lambs wool. The first piece of Shetland I bought was from Russell St. All of my knitwear in the 80's was lambs wool.
Saying that both shops sold Irish Aran.

Like the sound of that ^^^ - though I suspect the shirt would be heavier than the jacket!

Browsing The New Yorker's fantastic online archive, as I often do to while away the time and enter the psychic vortex of a frozen and fascinating past, I came across new evidence concerning the pull/popover nomenclature in the 12th September 1959 edition. An advert for Gant Of New Haven features a charming sketch of a handsome crew-cutted Ivy Leaguer in what is described as a 'Hopsack Oxford Pullover'. The shirt features a three button placket which comes half-way down the shirt front, completely contradicting my previous assertations which are, of course, complete nonsense. One must conclude that pullover-popover were different words for the same thing. It's a great ad which I would love to post up here, were that possible, which it isn't. Beneath the Gant ad is a nice simple one for Bass Weejuns - a pair of penny loafers with the tag line 'Traditional Choice....timeless in taste'. Trad!! What would Jimbo have said..?