Tallfellow

You cause your height to double, while your width and depth increase more modestly, multiplying your weight by four. This causes your appearance to approximate that of a half-elf, but a bit of your adorable halfling or gnomish features still shine through.

The spell fails if you are not a gnome or halfling, or if there isn’t enough room for your size to increase appropriately.

Note that nothing you are wearing or carrying changes size with this spell, so proper loose-fitting clothing and other precautions are recommended.