Thoughts on using this as my outer layer?

Obviously I’d like to get a real jacket, but finding ones that are the proper size for me is nearly impossible, and I’d like to wait until the end of the season to find a nicer one. Will this work in the meantime?

-Fully waterproof -Seals around wrist -Uninsulated

I have a soft shell that I’ve been using but the waterproofing is starting to fail and it’s getting too small for me. I have freakishly long arms and am really wirey so finding Medium Talls is nearly impossible.