"The scarf has been very useful to me on many trips"

Dear Mrs. Langenbach,

For a long time I wanted to thank you again for this wonderful, light and yet warm scarf that you created for me. The scarf has been very useful to me on many trips and now we have finally managed to take a photo that I am sending you in the attachment as a thank you.
Thank you very much and good luck!
Best regards
M. H.