I'm going to shamelessly crib this from a previous thread where Gothicmama wanted a capsule work wardrobe for £50 - I think it all still applies (I'm so lazy)...
one pair footwear (boots/shoes as you like but keep them polished and looked after)
one smart jacket (not part of suit)
two smart trousers
scarf/wrap thing
four or five tops (sleeve length will depend on aircon, heating etc - you can always leave jacket and/or they're a bit of a minefield in the winter unless scarf on if it's icy)
I don't wear black (and am evangelical about getting others to stop, it's so unimaginative), so if this was me picking from clothes I've actually got I'd do:
tan low-heeled boots
cream linen/cotton jacket
one pair chocolate brown trous
one pair tan trous
cotton tops with flattering necklines in
brown s/s
brown l/s
terracotta 3/4 s
olive green 3/4 s
one cream blouse in case need to be v formal
orange patterned scarf
but there's nothing to stop you getting black shoes/trous/jacket/scarf and coloured tops, or whatever colour combo you like.
Don't forget nice bag you can keep all your stuff in - armfuls of papers dropping everywhere never a good look. And if it matches your shoes so much the better .
...
For a five star hotel I'd err more on the side of blouses than cotton tops and would make more of an effort to be 'groomed' wrt hair and makeup.
I deliberately haven't mentioned skirts as I find trousers more useful - and skirts often demand a second pair of shoes which can take a sizeable chunk out of the budget, but if you have a suitable pair already a skirt gives a whole different look for little outlay.