You will be stumped for buying large ladies clothes anywhere. We have been 8 times all over the place and never found anything. They have woken up to the fact that men want bigger tshirts but not the fact that European, Australian and American women are often bigger. They class a uk size 14 as xxl. no hope for me then !!!!!!!!!
Yes there is the option of having things made but if like me you just wanted to purchase tshirts, trousers, shorts etc you won't have any luck either in Bangkok or the islands.

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Kiss
God laughs at people who make plans.