bless (someone's) cotton socks

Translations
пусть (кто-то) будет счастлив и в безопасности
The little boy was so polite, bless his cotton socks.
Мальчик был так вежлив, пусть будет счастлив и в безопасности.
Definitions
A British English expression used to show affection, endearment, or gentle amusement towards someone, often implying that the person is sweet, innocent, or well-meaning. It can also be used to express gratitude or sympathy.
Words
bless

verb
благословить
someone's

pronoun
чьи-то
cotton

adjective
хлопковые
socks

noun
носки