Vintage rare 70’s Andhurst button down, sz S (possibly a medium see description)

Vintage rare 70’s Andhurst button down, sz S (possibly a medium). Tag says S. I’m 5’8”, 150lbs for reference. This shirt is 100% nylon. It feels like silk that stretches. It fit me perfect when I was 125/130lbs. Now that I’m gaining weight it’s starting to look a little tight on me. Which would be ok if I was ripped. I’m not. Awesome colors, pattern, design and style! Silky type of fabric that feels great! Very thin. Great for spring and summer. Possibly the colder months with something underneath or a blazer worn over top. Looks awesome with jeans. Such a cool shirt. I wish it fit me a little better. I was in an accident that left me inactive for almost a year and I’ve gained all the wrong weight. Selling most of my clothes to get a few bigger items and also need the money. Any questions just ask. Thank you for looking!