I just want a good quality (thick fabric), slim fitting, long t-shirt with short sleeves and a proper, deep scoop neck.

[YetAnotherNewNameAgain]

The holy grail that is impossible to find.

They either have no sleeves, long sleeves, not a proper scoop, silly cut outs on the back, are too short or have thin fabric.

It's such a flattering style that I don’t understand why it’s so hard to find.

The sleeves on this are really strange though. Not short and not long.

So annoying that it's so difficult to find them.

Have you tried Ulla Popken? I have these in a range of colours and they're very flattering.

https://www.ullapopken.co.uk/en/tops/t-shirts/essential-front-pleat-tee/p/796473466-1128

I have been looking for exactly this for many months, nay years. My sad conclusion is it doesn't exist. The M&S ones are a nice shape so I thought hurrah!... till you wash them very gently once and they turn into a rag.
Oh for the highstreet of 20 years ago!

https://www.cos.com/en-gb/women/womenswear/tshirts/slim/product/slim-scoop-neck-cotton-t-shirt-lilac-1272305003

This is very thick, just got one 🙂

My best ones in this style are from Fat Face and randomly.... Mountain Warehouse. A few years old now but worn constantly so may be worth a look?

Try Boody?! Lovely tops and clothes

She doesn’t want baggy. She wants fitted

I sized down and this fits nicely, not as baggy as this photo. I’m 5ft 7 and it’s long enough on me.

www.hush-uk.com/hari-scoop-neck-cotton-slub-t-shirt-white/005675-0001-XS.html?utm_source=google&utm_medium=cpc&utm_campaign=sale&utm_content=existingusers&gad_source=1&gad_campaignid=22000153830&gclid=EAIaIQobChMI7NmokICujgMVdYpQBh2EpQrxEAQYAiABEgLgHvD_BwE

I'm the same OP. Long body, big bust. It's a nightmare.

I do have a lovely Rapanui scoop neck tee which is a few years old but their current range is all crew neck apart from a 3 pack of plain colours.

They do short sleeved ones too! 😂😂

The jigsaw ones are lovely but perhaps may be too thin

https://www.baukjen.com/products/baukjen-essential-scoop-top-with-lenzing-ecovero-pure-white?country=GB&tmsrc=googlead&tmcid=20555597977&tmsid=151879278605&tmid=673933293505&tmkw=&gad_source=1&gad_campaignid=20555597977&gbraid=0AAAAACrTFARy75Bv0qmBRfzo4a9_SPii8&gclid=CjwKCAjwg7PDBhBxEiwAf1CVu9LAFYupbrQK-QeObFbj7gOp2DpQy78XlA6mYW4xuN_wt5j_poTYlRoC0rUQAvD_BwE baukjen ones are lovely too

James Perse do amazing quality T-shirts but they’re (very) expensive. I’ve occasionally found them in TK Maxx and I keep an eye on Vinted.

Like this:
https://www.jamesperse.com/products/stretch-lotus-deep-v-short-sleeve-tee-black-wlsr3034?
or
https://www.jamesperse.com/products/v-neck-cropped-tee-white-wmtp3968

Or this (in various colours) in the sale that’s a true scoop neckline but may be too ‘casual’ for you:
https://www.jamesperse.com/products/cotton-crepe-deep-uneck-tee-peony-wsvh3182cu

Lurking
I am 5ft 10 with big boobs and need a scoop or v neck that isn’t overly clingy but fitted enough to be flattering

Jigsaw used to be really reliable, but the quality has really declined. I’m still wearing a couple of ancient ones, but they’re on their last legs.

I ordered these but returned them - really nice t shirts but not very long in the body. (at least not long enough for me, I’m 5ft 9in)

This?

https://www.poetryfashion.co.uk/product-V175-POETT/colour-bj-pale-yellow/tshirts-tops/scoopneck-hemp-organic-cotton-tshirt.htm

I did notice they've reverted back to the supima cotton they used a couple of years ago

Vera Moda do some really nice deep
scoop long t shirts
I’ve got a few and they definitely show off your cleavage 😂 and they are longer than the usual waist type one
I love mine
they don’t look that deep in the picture but they are if your fairly busty like me ( DD. Cup but slim )

And I have a few of these they are longline so if you want a longer length t shirt they are great

when searching use the words longline deep scoop t shirts - that’s what I did when i was looking for mine

John Lewis, put neckline etc. in the filter.

As pp have said, scoop necks aren’t fashionable at the moment I’m afraid. I couldn’t tell you the last time I saw someone wearing one.

If you would consider a bodysuit, you could try Not Basics (formerly known as Pantee). I am 6’ with a long body and very large bust and find their length perfect as long as I size up (I’m a 14-16 and wear their 2XL). The quality is excellent and they are double-lined so your bra never shows through even in white. They don’t do a scoop shape but you could try their square-neck: https://notbasics.co.uk/products/organic-cotton-square-neck-bodysuit-black?srsltid=AfmBOoq_32DQ9tI0Uk2TP2lv4uhmheRaDlVbFUjXb9plUCDQawFvwt7J

I was going to recommend these.
They are my basic every day t shirt

If you can find the right scoop neck but with long sleeves, take it to your local alterations guy and have them taken up. I’ve done that with V necks.

@Frostiesflakes - that is a lovely tee - where is it from?

OP - I was going to suggest Boden double layer scoop tee but someone up thread has already posted it too. Did you take a look? Seems close to what you want.