@TeaChocKitKat I'm thinking that you might mean more "fit & flare" than A-line, if you're searching online - as most tea dress styles are fitted at the waist then flare out? Shirt-waister styles with fullish/flared skirts may also suit?
I'm also presuming that you like soft/pastel colours with your pale, fair colouring, if you've ordered pale blue & pinkish-coral dresses so far?
In my experience, I'd be selective about fabric type. Cotton, silk, linen, viscose & often blends thereof, are all generally good choices in the heat (people on MN often complain about staining silk in hot weather - but I have never found that to be an issue - Mitchum antiperspirant!!).
I did start searching some petite ranges & was dismayed by some of the horrors out there - Karen Millen is a sea of (expensive!!) polyester ... very grim ... Seasalt prints are indeed frumpy as a few others have said, & I wasn't too impressed by Joe Brown or White Stuff either ... Lots are jersey too, which I think might be too heavy?
About 15 to 20 years ago Whistles used to do pure silk tea dress styles - they brought out different versions several years in a row. They were very 1930s-40s in look. I loved those dresses & had a few iterations! I did have a look & found these on Vinted. The waistline tended to be high on these dresses on me (I'm quite tall), so I think that they should sit at the normal spot on you. I would make lower offers on these if you like them - you could get some real bargains & they are excellent quality &, I think, quite timeless?? I would check measurements though - these are 12s & 14s but if they're bias-cut (like the third one) a 14 or even 16 would probably be better.
https://www.vinted.co.uk/items/6524423870-vintage-whistles-silk-dress (love the sleeves & print of this one!!)
https://www.vinted.co.uk/items/7288624055-whistles-silk-dress
https://www.vinted.co.uk/items/7788353434-whistles-silk-polka-dot-dress-navy-blue-uk-12-retro-classic-40s-50s-fit-flare
https://www.vinted.co.uk/items/8107121343-whistles-fitted-silk-tea-dress-pretty-design-with-button-detail-size-14
https://www.vinted.co.uk/items/6718021074-whistles-100-silk-dress
(I had this one & loved it!! It was well above the knee on 5"8" me so I'm sure would be a perfect length on you.)