I am wee and curvy too, but in between petite and standard sizing, which is murder! I feel you.
I also love a bargain but have had terrible eczema and the dermatologist told me to replace my entire wardrobe with natural fibres. So since last November I've been gradually replacing my clothes each month with 1 or 2 cotton or linen items that are higher end. I now find my bargains in posher online shops, high end of high street like Massimo Dutti, Boden, Sézane etc cause I do require bargain hunting to be a part of my life 😆
I find that I need high waisted trousers and belts to not look like a sack. I need my ankles on show to balance out my heavy bottom half. So I now only buy cropped, high waisted trousers or jeans. Usually Boden sale, M&S (have two pairs of wide leg cropped work trousers in black & navy) or my favourite bargain Sainsbury's Tu for petite jeans. I find all of these brands work for me in my inbetween petite and standard flippin' legs.
Shirts with high neck but buttons open, boat neck and scoop necks tops. Folk say V necks with big boobs but I find they make me look matronly.
I find vests, long sleeves or 3/4 length sleeves to be better than t shirts as t shirt sleeves cut me off right at my boobs, making me look massively top heavy.
I then do invest in high quality tops and shirts that I tuck in. Like £90 Sézane pure cotton shirts or Breton's. They do lovely knitwear that can be tucked in too. Boden sale linen shirts with a couple of necklaces and teh sleeves rolled up a wee bit and tucked in to high waisted trousers or jeans.
Skirts just don't seem to work for me, make me look massive of the belly.
I'm also good in jumpsuits, they seem to balance out the hour glass and if they are cropped at the ankle it seems to be more slimming. Free people do some good ones for the summer, so do The Nine and I have a couple from ASOS that I've had for years.
I am also a fan of a Boden sale dress, usually a shirt dress with the buttons undone. Avoiding the frumpy stuff! If you like colour Boden T shirts and long sleeve tops are really good quality, I've had some that were £30 quid but have lasted me over 5 years. I never buy full price from Boden, I stick it in my basket and wait for the 20% off or the sale.
I have a decent long puffer coat, a beautiful blue, burgundy & gold weave coat, a Mac (not double breasted, single or my boobs are a flippin' enormous shelf), a croppe denim jacket and a couple of cropped black and cream singe breasted smart jackets from Massimo Dutti. They make jeans and a t shirt look pulled together. I figured I'll have these coats for 20 years + so worth the money I've paid over the last 3 years for them.
I also have Marks and Sparks chunky loafers that while only £50 I have had reheeled and they just keep going, and Nike Air Force Ones that go with most things. But I need my ankles on show or i look mega dumpy & chunky.
I have invested in treats like a couple of high quality belts that match my loafers and started to wear my gold necklaces with Oliver bonas gold earrings and folk comment on looking nice but really, I'm in mostly high street with a nice shirt/top or t shirt with a smart jacket and the accessories are what seem to be pulling it all together.
I also like colour but I've worked out with my colouring to stick to 4-5 that compliment each other. Anything else I buy I realise doesn't get worn and just sits in my wardrobe.
It's taken me a long time to work out what suits me as wee and curvy doesn't translate to chic very easily and I've learned style is more important for me than fashion. I learned a lot from the 'fashion maths' Instagram videos. Now in my mid life I feel better about how I look, having accepted my shape than I did in my youth. It's definitely possible to feel good, good luck!!