No OP, you're not the only one!
I am also worried about clothes buying this year. I have long legs (35" inside leg, can get away with a 34" in jeans and trousers, but prefer a 36" with heels) but Long Tall Sally is far too expensive for me even buying one pair - and different designs fit differently (I've been a 12, a 14 and 16 all on the same day and in the same shop!) but I can't afford to buy 3 different sizes of something to find out which one (if any of them) might fit me.
I used to stock up on Primark jeans when I was near a branch (don't live anywhere near one, so that was about twice a year) because they do some of their jeans in 34" leg length. Unfortunately, even if I could trust their sizing (I can't - always have to try on several pairs in different sizes and cuts) they were ridiculously cheap and really good quality for the money. But they don't do online, so that's no good either now 
I was ironing the two pairs of jeans I have left yesterday. One is wearing through really thinly and really need replacing. Except I can't afford to buy several pairs just to try and be lucky that one fits, and the shop I might trust more than any other, and who don't charge ridiculous amounts for their jeans (Primark) don't do online shopping.
Top Shop used to do long-length jeans (even if expensive) but they've gone now. M&S, Next I can get to locally, but neither do anything longer than a 32 inside leg". New Look do some long leg lengths, but now I'm back at the problem of not knowing which size will fit and can't afford to order several pairs to find out! We have a local New Look, but they don't stock the 'Tall' range in the shop, and I can't even try on jeans that are too short to find out my size because the changing rooms are shut (and then we're back to the problem of can't afford to buy a few pairs to bring home, try on, and take back...).
I'm actually worried that in a few weeks I won't actually have any trousers left of any kind to wear at all. In winter. I don't really have any winter skirts or dresses (I don't have to dress up for work - jeans are my uniform... and then I'd have the same problem shopping for skirts and dresses anyway!). All I've got left is summer stuff!
It was bad enough for tall ladies like me even when we did have a full high street and shops with changing rooms we could actually use. Now we can't try anything on, and some shops that we did rely on are going, and others either expect money up front for several pairs, or don't even offer an online option (I could actually afford to buy 3 pairs from Primark!) so it's going to be really difficult for tall ladies who don't have much money but still need long length jeans and trousers to dress in at this time of year! I really wish I was 'petite' sometimes!!! There's plenty for them in every shop! (Or so it seems - no offence to petite ladies intended!)
I really get fed up with the people who glibly say, "Oh just order a few sizes online and see what fits and send the rest back". It's really not that easy, financially doable, or practical! 
Sorry, rant over! 