Yes, typically an 18 plus size is bigger than an XXL in women's clothing.
Here's a breakdown:
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"Straight" Sizes vs. Plus Sizes: Standard or "straight" sizes generally range from 00-16/18 or XXS-XXL. Plus sizes usually start around a women's size 12W and go up to 28W and beyond, often represented as 0X-4X and larger. Therefore, where 'straight sizes' end at XXL, plus sizes start, making an 18 plus significantly larger.
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Size Overlap and Variations: There can be some overlap between the end of "straight" sizes and the beginning of plus sizes, and sizing can vary between brands. However, an 18 plus is specifically designed to accommodate a larger bust, waist, and hip measurement than an XXL.
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Understanding Plus Sizing: Plus sizes aren't just scaled-up versions of straight sizes. They are designed with different proportions and considerations to fit curvier body types more comfortably and flatteringly.
In conclusion, while some XXL garments might fit someone who wears a smaller size in plus sizes (like a 14W or 16W), an 18 plus is generally larger and designed for a different body shape than what is typically accommodated by an XXL in "straight" sizes.