ドレス

ドレス refers specifically to a formal or dressy one-piece garment for women. It implies elegance and formality.

ドレス VS ワンピース:
In Japanese, ワンピース is the general term for a one-piece dress (casual or semi-formal), while ドレス specifically implies formal or special-occasion wear. A casual sundress would typically be called a ワンピース, not a ドレス.

COMMON TYPES:

• ウェディングドレス: wedding dress
• イブニングドレス: evening dress
• カクテルドレス: cocktail dress
• ミニドレス: mini dress

COMMON EXPRESSIONS:

• ドレスコード: dress code
• ドレスアップする: to dress up
• ドレスを着(き)る: to wear a dress

NOTE:
The broader meaning of "dress" as general clothing (as in English "dress code" or "dress sense") is rendered as 服装(ふくそう) in Japanese.