The default value is 0.7, which I suppose is not suit for hot summer days. Since it is between 0 and 1, can I say 0 means no clothes while 1 is in very cold weather? There must be some empirical values for different seasons, like in summer the value may be 0.4, while in winter 0.95. I’ve only found one article that says in summer the value is 0.46 (https://www.sciencedirect.com/science/article/pii/S1618866716303533), no other clue…
From what I know, here in the UK, CIBSE´s guide A refers to the following:
And pulling the string and taking a quick look through the references, they refer (among other literature) to these articles:
BSI (2009a) BS EN ISO 9920: 2009: Ergonomics of the thermal environment.
Estimation of thermal insulation and water vapour resistance of a clothing
ensemble (London: British Standards Institution)
ISO 11079 (2007) Ergonomics of the thermal environment — Determination
and interpretation of cold stress when using required clothing insulation (IREQ)
and local cooling effects (Geneva: International Organization for
Standardization)
Humphreys MA (1979) ‘The influence of season and ambient temperature
on human clothing behaviour’ in Fanger PO and Valbjorn O (eds.) Indoor
Climate (Copenhagen: Danish Building Research)
Parsons KC (2002) ‘The effects of gender, acclimation state, and the
opportunity to adjust clothing and physical disability on requirements for
thermal comfort’ Energy and Buildings 34 (6) 593–599
Metje N, Sterling M and Baker CJ (2008) ‘Pedestrian comfort using
clothing values and body temperatures’ J. Wind Eng. Ind. Aerodyn. 96 (4)
412–435
Morgan CA, de Dear R and Brager G (2002) ‘Climate clothing and
adaptation in the built environment’ Proc. Conf. Indoor Air 2002: 9th Int.
Conf. on Indoor Air Quality and Climate, Santa Cruz CA 5 98–103
I haven´t looked into them and some are far more recent than others, but maybe they help with what you´re looking for 
Rafael
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Thank you for your help, I’ve found this article, compared with the above article, it seems that different people have far different choice.
One more question is: does the color effect more or the type of clothes (summer T-short uncovering arms or winter covered by several thick clothes)? Since the absorption value is between 0 and 1, there must be a table already concluded the relation of the type and color of clothes and the explict value I think.
The article (https://file.scirp.org/pdf/AJCC_2018060615554785.pdf)
Thank you Rafael, what a shame that I’ve missed the article mentioned in the component:“https://escholarship.org/uc/item/89m1h2dg”.
Done!
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