The jacket runs true to a bit slightly small.  It is well-made and has an inner and outer zipper.  Interestingly, it is made from recycled water bottles!
It is very compressible and ideal for packing.  It can take a vest from Charles River:<a data-hook="product-link-linked" class="a-link-normal" href="/Charles-River-Apparel-Women-s-Plus-Size-Radius-Quilted-Vest-Black-Grey-X-Large/dp/B00PWNN7GO/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Charles River Apparel Women's Plus-Size Radius Quilted Vest, Black/Grey, X-Large</a>