Ответ:
Dear Patricia,
Hi! Thank you for your letter. I should say that dress code for birthday depends on the party itself. While inviting my friends I usually say them in advance about the style of my birthday party. In Russia, if I have a party in the restaurant or café, my guests often choose cocktail or long dresses for women, and suits with ties for men. If I have a party in the countryside, jeans, T-shirts, shorts and caps will be suitable. As for me, I usually wear something comfortable but pretty in order not to be a black sheep. In general, I do not pay much attention to my clothes. If I were you, I would not sorry for her, because skinny jeans with a T-shirt is not a bad choice. Take it easy! What birthday presents do you receive? Are they useful or useless? Are you happy with them?
Best wishes,
Vik