Shopify edits

I need a web designer to help with a few basic edits to a shopify clothing site. I have recently purchased a theme (Wokiee Theme) and need to add the following option to the site:

The ability to shop different elements of an outfit on one product page i.e Shoes, Trousers, Top etc.

The ability to select related products against specific items

Adding a filter system to the menu so people can filter by sizes etc.