There ain’t no such bed size as full/queen. Most bed linen makers offer that size, then king. If you have a queen bed (I do) the full/queen size will be too small. I’m talking about quilts, etc.
I’m annoyed.
Also, many don’t make fitted sheets to properly fit today’s thicker mattress.
Real bed sizes are:
Full / Double 54" 75"
Queen 60" 80"
See!
Peace,
mangeorge
IME, “full/queen” size is never applied to sheets or anything fitted, but only to quilts, comforters and blankets. To me, it means “This would be generously sized for a full-sized bed, but stingily sized for a queen bed”. My husband and I have a queen-sized bed, so we always go for King-sized in blankets and comforters.
In one way, it sucks that they do that, in another way, I can see the benefit: if you have a full bed and upgrade to a queen, you do need to get new sheets, but your blankets and comforters will still pretty much work.
In face, my husband and I have often debated getting a king bed. We’ve enjoyed them times we’ve had access to them (hotels and the like) but one of the big reasons we don’t is not so much the cost of the bed itself, but the cost of replacing all of our sheets. 
I’m suspicious about bed linen sizes, also. My DD’s bed must have some kind of odd sized mattress because I have not yet met a sheet that fits the mattress properly- they are always loose on all four sides. Very annoying.
J. C. Penney sells a fitted sheet with stretchy fabric (like jersey) at the top and bottom, and they fit my pillow top mattress really well, even with a memory foam pad on top of the mattress. Takes all of the stress out of making the bed, especially since you know which side is the top/bottom, because of the jersey.
I’ve always liked Penny’s, but there’s not one close to me. They always have good value for your money. I think I’ll find one and start making the trip. Or online, but I prefer to touch. I think I’ll go online and see where the closest one is.
Thanks, AP, for the reminder. 
At least you people have standard size mattresses–my mattress is at least 60 years old (probably more) and is some weird size between twin and full. I get full size sheets and use some sheet garters to size it.
You have a mattress that old and it’s still sleepable? I get maybe ten years. I weigh well over 200lbs, so that may have something to do with it. 
BTW; that means I can provide warmth in the winter and shade in the summer.
Yeah, the bedframe itself is waaay old–a rope bed, although it has been updated to a box spring (which is super creaky). My grandmother bought it at auction before my mom was born ('50) and it was my mom’s bed growing up and then it was my bed growing up too. It sags in the middle, and it’s stuffed with hog hair, which I am wildly allergic to, so now there’s some kind of allergy-shield wrap around it along with the mattress pad and sheet.
Maybe someday I will get a custom mattress for it.
It is almost as annoying if you have a mattress of “normal” thickness and get new sheets that have much deeper pockets than you need – you just can’t get those puppies taut, even with extra tucking.
That drives me nuts. Do you know of anywhere one can get fitted sheets that actually fit an old full-size mattress?
This is your answer:
Sheet garters are it. They are elastics with grippy things (yes, that’s a technical term) at each end. You attach them at all four corners, and get sheets that fit nice and taut.
Is there any such thing as sheet sets that do NOT include a fitted sheet and instead consist of two flat sheets? Or, alternatively, is it possible to simply buy one flat sheet at a time? Fitting two flat sheets on the mattress using “hospital corners” (one top/head of the bed, one bottom/foot of the bed) invariably yields a longer-lasting base as that elastic crap invariably comes loose after one bad toss ‘n’ turn night
Bonus points if you can find a link to flat flannel sheets.
And, oh yeah! What idiot said we HAD to have fitted sheets anyhow, the bastard? On what PLANET does that pathetic bit of elastic make life easier?
Hah! do you bounce a quarter on your sheet too? 
Excuse me if I seem a little grumpy, but you just reminded me of boot camp.
Bt the way, these will hold your sheet taught, but you gotta have fingers of steel to install them. You need three on each side and two on each end.
The company commanders when I was in boot camp didn’t demand quarters, but they were really unreasonable regarding “catch edge sheets” and demanded that the flat bit was on top and the funky “catch hem” was on bottom. Stupid, but it makes sense - if you’re not smart enough to put the sheet on upside down can we trust you with a $9M plane?
Gramma taught me about hospital corners when I was nine years old but only with the top sheet, and she hated that stupid elastic stuff, too. She’d have told me a lot more about it but she is a repressed Lutheran so the most I can get out of her is “darn”. The elastic got worse as she aged and her arthritis increased: Sure, yeah, it’s hard to pick up the end of the mattress and jam 8" of material in there, but it’s harder to match the elastic seam with the mattres seam with the mattress depth with the…
But any idiot can do hospital corners, and even idiots can do hospital corners that stick. I don’t know when elastic bottom sheets became the industrial standard; I don’t know who decided the depth of the pocket; I don’t know which women’s magazine declared them to be la creme de la creme. The reason I neither know nor care is because all of them are completely wrong. The “expert” who decided that elastic was “the way to go” was an obvious Goodyear plant, and I hate him. And why do I know it was a “him”? Because no one who ever went from gramma’s bed to mom’s bed to his own bed ever actually MADE his own bed.
Of course you can. They sell single flat sheets right along side the matched sets. Among other things I asked for and got two flat sheets for Christmas, because fitted sheets are useless with a waterbed.
For Christmas I bought my better half new sheets & a comforter. We have a FULL size bed, w/ a pillow top. I bought a queen-size sheet set and a King size comforter. We’re sleeping better than ever before.
I’ve never owned decent thread-count sheets before, these new ones make me feel like I’m sleeping on a cloud.
I want to buy separate pillowcases. My husband and I use almost a dozen pillows between us, and we need LOTS of pillowcases. Sure, they’re very simple to make, but I’d just as soon buy them.
Try something like Linen Source, they sell some sets, but sell most of their sheets by the piece so you could get two flats or whatever else combination you like. They also sell pillowcases, usually by the pair, so you can order 2, 4, 6, etc.
They have tons of flannel, but here is a link to one flannel page.
My college dorm a (very) long time ago issued two flat sheets at the beginning of term. After that you exchanged only one sheet at a time weekly. The instructions were to bring your bottom sheet in, put the previous week’s top sheet on bottom, and use the new sheet as the topsheet. All year long. I can understand the reason, and the top sheet shouldn’t be too ‘used’, but still…you never got the feel of slipping between two clean sheets.
That’s funny, it’s exactly what we had to do in juvy! Did you also get limited to seven sheets (counted yourself on the “honor system”) of toilet tissue?
Juvy = Street College. Well, sort of.