Shoe size is pretty much the same but dress and clothing is much more complicated.
I am used to North American sizing. If I buy clothing made in N america or is from a North American company the sizing is what you are used to.
However - when I buy clothes in the DR made outside North America - the sizing is VERY different. For example - if I wear size 6 jeans in North America - I wear a size 13 here in the DR (if made outside N America)
So, we need more info to be able to help you!