Can you please check these sentences I'm doubtful about?

Thank you very much.

1) My parents like my clothing style because they think that wearing practical clothes is the most important thing/most important is to wear practical clothes/
2) I was given these trousers for my birthday Yesterday but they are too tight. Is it OK if I change them?
3) I'm afraid they were so popular that they've all been sold and I'm afraid we won't be supplied with any more by the manufacturers.

1 answer

1 = fine

2 = no capital Y on "yesterday" - comma needed after "yesterday"

3 = Rephrase so that "I'm afraid" is used only once, not twice, and there's a comma after "sold."