I am short and size 8 and virtually only wear jeans now I don't work. I have very very many pairs of jeans. I buy everything online and buy multiple pairs and have big Trying onsession at home then take rejects to PO
Banana republic jeans are brilliant and they do petite. I take 26 or 27 in their jeans. Especially like their girlfriend ( but in gap, 27 is much too big, go figure)
J crew are also brilliant and do petite lengths. I have 3 pairs of their Demi crop. Sizing the same as above. You buy via uk website and they ship. No fees or customs any more.
I never need to have those 2 brands altered. I am 5'1 and a half
Hush jeans are good, I especially like their boyfriend style I pay a local dressmaker £3 to take them up a couple of inches
Jigsaw jeans ( Richmond for skinny that are not glued to your leg) or Hampton boyfriend are good too. I have had weirdly only had to have one pair of length 30 taken up the other length 2 length 30 were fine!
Boden jeans have different lengths and some of their style are great. You just have to buy a few and try. I didn't like the new straight style as they swamped me even in petite.
Frame le high straight are good but pricey. Different leg lengths
M&S jeans have had a revamp and reviews are good. Cheap!
I have one pair of fat face jeans which surprised me, I didn't expect them to be good but are!
I have one pair of top shop jeans which are meant to be cropped which are ankle length ( I think just the straight style no name). Their editor style has good reviews and I'm waiting for a sale for those.
I am considering a pair of everlane jeans as they have such good reviews.
Hung denim too are highly rated
Levi's 501 or wedge are rated high and look good in reviews.
Have fun!