Two trades for un registered dealer

Turnover from both the business put together should not exceed 40 lakhs.( 20 LAKHS for certain states )
Also there should not be any sales outside state,otherwise you need to register under GST.

NEED TO FILE I.T. RETURN IF GROSS INCOME ABOVE 2.5 LAKHS

I think it's possible U can do trade in clothes and readymade business in individual status(as unregistered dealer) and medicals stores business in HUF status (as unregistered dealer), As PAN of both the entity is different than there is no aggregation of turnover of both business.
But you can not made supply to other state otherwise it's compulsory ti take GST registration

You can file the separate return for both as Individual and as HUF.