Linen is practical in summer heat and it has enough natural texture to feel intentional rather than just lightweight. A linen dress in black or dark neutral tones works for a funeral in warm weather because the fabric itself suggests care and consideration. Linen wrinkles and that is part of what makes it honest and appropriate. The dress should be a simple cut without a lot of gathering or volume. Short sleeves or sleeveless work with linen better than long sleeves in summer. The fabric breathes which matters when you are attending services outdoors or in spaces that are not air conditioned. These are the linen dresses that acknowledge the heat without compromising on formality.