If you optimise for plurals will google pick you up for the singular version as well? I guess it does but doesn't prioritise you as highly as if you originally optimised for the singular version.

I ask because as a wholesale company our customers generally type in plurals, but I have noticed that the singular version of words generally has a higher frequency of searches. For example T shirts is searched for 183400 times whereas T shirt gets 224000 searches. I would therefore also like to optimise for the singular but do not want to do this to the detriment of plural search terms we currently do well on

Thanks for your help