Frump
/frʌmp/
Definition 1 of 1
Pro Tip 1/3Negative Connotation
Describes someone negatively based on their appearance, often unfair or superficial. 
Calling her a frump just because she prefers comfort over trends is quite judgmental.
Pro Tip 2/3Cultural Shift
Perceptions of 'frump' change over time; what seemed unfashionable before may now be trendy. 
Vintage styles are in, so she's no frump by today’s standards.
Pro Tip 3/3Common Misuse
Don't confuse 'frump' with someone who is casually dressed. It implies lack of style, not comfort. 
Wearing sweatpants doesn't make you a frump if you style them well.