Hide prices for logged-out users, filtering by category, and change add-to-cart buttons to login redirect.

functions.php

<?php
/*
    Hide normal add-to-cart buttonsfor logged-out users, filtering by category, and change add-to-cart buttons to login redirect.
*/
add_filter('woocommerce_is_purchasable', 'semper_modify_purchasable');

function semper_modify_purchasable( $is_purchasable ) {
  if ((has_term('hoodies', 'product_cat') && !is_user_logged_in())) {
	  if (is_singular()) {
      remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_add_to_cart', 30 );
      add_action( 'woocommerce_single_product_summary', 'semper_login_for_price_button', 31);
    }
    return false; 
    
  } 
  return $is_purchasable;

}

function semper_login_for_price_button() {
  echo sprintf('<a class="single_add_to_cart_button button alt" href="%s">%s</a>', esc_url(get_permalink(wc_get_page_id('myaccount'))), __('Login to see prices', 'text-domain'));
}

add_filter('woocommerce_loop_add_to_cart_link', 'semper_modify_add_to_cart_link');

function semper_modify_add_to_cart_link($add_to_cart_html) {
  if ( has_term('hoodies', 'product_cat') && !is_user_logged_in() ) {
    $add_to_cart_html = sprintf('<a href="%s" class="button">%s</a>', esc_url(get_permalink(wc_get_page_id('myaccount'))), __('Login to see prices', 'text-domain'));
  }

  return $add_to_cart_html;
}

// add_filter( 'woocommerce_variable_sale_price_html', 'semper_hide_prices', 10, 2 );
// add_filter( 'woocommerce_variable_price_html', 'semper_hide_prices', 10, 2 );
/* 
	After testing it for a bit I don't think it's necessary to hook into the above unless you needed to change 
  something specific to variable prices ONLY. 
*/
add_filter( 'woocommerce_get_price_html', 'semper_hide_prices' );
 
function semper_hide_prices( $price) {
  if (!is_admin() && has_term('hoodies', 'product_cat') && !is_user_logged_in()) {
    $price = '##.##'; // You can set this to '' to remove the price altogether. 
  }
  return $price;
}