@Chris
Angie's right, I've used Kettlewell before! I'll try to be thorough, but feel free to ask if there's something I haven't covered (&/ or PM me).
THE PROCESS:
My stylist also recommended Kettlewell, but I'm actually from the UK so my ordering likely differs to yours. That said, I'm currently in HK & found international shipping to be efficient (as you stated, free shipping above a certain amount), with the sales team promptly responding to enquiries. Can't remember if I had to supply my own returns courier, but do remember it was an easy enough process through their website (though this was a while back, so things may have changed).
The order comes in a well secured cardboard box & each item is in its own plastic bag (not as environmentally friendly, but it does ensure your items stay dry in worldwide transit).
THE CLOTHES:
Like you, I find their items to be more on the classic side (or simply not my style - like the jewellery). But this can be a good thing, since it allows you to use their pieces as building blocks within different types of outfits. E.g. the ruched jersey pencil skirt (can't remember the name, sorry) - many folk like it with the cowl neck top to make a column of colour, but I also like it with a longer topper for drama.
Speaking of which, if you'd like to see examples of normal folk wearing the actual clothes (to give you an idea of how they pair) I believe their Facebook group is called something like the 'Kettlewell Colours Club'.
As for the clothes themselves, I mostly own bottoms from Kettlewell because they use a lot of synthetic materials (I'm guessing because it's easier to keep the dye consistent? So far all my clothes from them have been true to my monitor colour (ofc YMMV though), even across fabrics (e.g. my merino poncho & jersey maxi skirt). Yes I wish they posted garment measurements, but I've found the sizes to be true to the chart, depending on the fit you wish for (I had to size down to my usual size in the jersey pencil skirt for example, because I usually size up to accommodate my hips, but that made the ruching disappear). And nothing has shrunk in the wash after years (my stylist appointment was in 2019!) - though I don't tumble dry *at all*.
So whilst I do wish Kettlewell would do more natural fibres, I'm satisfied with what I have. I find it useful to filter the colours according to the filters first (mine are Deep and Warm rather than just 'Dark Autumn' - plus my stylist gave me specific shades I should try, since I can 'borrow' from Winter). If you don't see something you like, they often rotate their offerings (the 'Imogen' top is a crowd favourite for example, & it resurfaced recently - even though it's viscose, I wore it for international travel & didn't overheat).
Hope that helps? Keep us posted if you do end up ordering from them