Create Drop Down Menu ORDER FORM with Variations

Hi guys,

I'm trying to do a order form for my clients in Google Sheets and I came across a problem..
Basically this is for a stock of T-shirts and Hoodies I have available in a range of colours and sizes.

Example

STOCK:
T-SHIRT - Black (S,M,L,XL), White (S,M,L,XL)
HOODIE - WHITE (S,M), YELLOW (S,M)


I want the order form to find the available options for the specific product. When you Choose from drop down menu T-SHIRT in the next cell where you have COLOUR there will be available options BLACK and WHITE.

I did managed to do it with all possible variations but then you have an endless list to choose from. So there needs to be another solution for this.

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Any help will be much appreciated!